<SEC-DOCUMENT>0001193125-18-152769.txt : 20180504
<SEC-HEADER>0001193125-18-152769.hdr.sgml : 20180504
<ACCEPTANCE-DATETIME>20180504161056
ACCESSION NUMBER:		0001193125-18-152769
CONFORMED SUBMISSION TYPE:	8-K
PUBLIC DOCUMENT COUNT:		3
CONFORMED PERIOD OF REPORT:	20180503
ITEM INFORMATION:		Entry into a Material Definitive Agreement
ITEM INFORMATION:		Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant
ITEM INFORMATION:		Financial Statements and Exhibits
FILED AS OF DATE:		20180504
DATE AS OF CHANGE:		20180504

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			GATX CORP
		CENTRAL INDEX KEY:			0000040211
		STANDARD INDUSTRIAL CLASSIFICATION:	TRANSPORTATION SERVICES [4700]
		IRS NUMBER:				361124040
		STATE OF INCORPORATION:			NY
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		8-K
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-02328
		FILM NUMBER:		18808031

	BUSINESS ADDRESS:	
		STREET 1:		222 WEST ADAMS STREET
		CITY:			CHICAGO
		STATE:			X1
		ZIP:			60606-5314
		BUSINESS PHONE:		3126216200

	MAIL ADDRESS:	
		STREET 1:		222 WEST ADAMS STREET
		CITY:			CHICAGO
		STATE:			X1
		ZIP:			60606-5314

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	GENERAL AMERICAN TRANSPORTATION CORP
		DATE OF NAME CHANGE:	19750722
</SEC-HEADER>
<DOCUMENT>
<TYPE>8-K
<SEQUENCE>1
<FILENAME>d550501d8k.htm
<DESCRIPTION>FORM 8-K
<TEXT>
<HTML><HEAD>
<TITLE>Form 8-K</TITLE>
</HEAD>
 <BODY BGCOLOR="WHITE">

 <P STYLE="line-height:1.0pt;margin-top:0pt;margin-bottom:0pt;border-bottom:1px solid #000000">&nbsp;</P>
<P STYLE="line-height:3.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1px solid #000000">&nbsp;</P> <P STYLE="margin-top:4pt; margin-bottom:0pt; font-size:18pt; font-family:Times New Roman" ALIGN="center"><B>UNITED STATES </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:18pt; font-family:Times New Roman" ALIGN="center"><B>SECURITIES AND EXCHANGE COMMISSION </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:12pt; font-family:Times New Roman" ALIGN="center"><B>Washington, D.C. 20549 </B></P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P><center>
<P STYLE="line-height:6.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1.00pt solid #000000;width:21%">&nbsp;</P></center> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:18pt; font-family:Times New Roman" ALIGN="center"><B>FORM <FONT
STYLE="white-space:nowrap">8-K</FONT> </B></P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P><center>
<P STYLE="line-height:6.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1.00pt solid #000000;width:21%">&nbsp;</P></center> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:12pt; font-family:Times New Roman" ALIGN="center"><B>CURRENT
REPORT </B></P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:12pt; font-family:Times New Roman" ALIGN="center"><B>PURSUANT TO SECTION 13 OR 15(d) </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:12pt; font-family:Times New Roman" ALIGN="center"><B>OF THE SECURITIES EXCHANGE ACT OF 1934 </B></P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:12pt; font-family:Times New Roman" ALIGN="center"><B>Date of report (Date of earliest event reported): May&nbsp;3, 2018 </B></P>
<P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P><center> <P STYLE="line-height:6.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1.00pt solid #000000;width:21%">&nbsp;</P></center>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:24pt; font-family:Times New Roman" ALIGN="center"><B>GATX Corporation </B></P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>(Exact
name of registrant as specified in its charter) </B></P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P><center>
<P STYLE="line-height:6.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1.00pt solid #000000;width:21%">&nbsp;</P></center> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="100%" BORDER="0" STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:8pt" ALIGN="center">


<TR>
<TD WIDTH="34%"></TD>
<TD VALIGN="bottom"></TD>
<TD WIDTH="32%"></TD>
<TD VALIGN="bottom" WIDTH="1%"></TD>
<TD WIDTH="32%"></TD></TR>


<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" ALIGN="center"><B>New York</B></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top" ALIGN="center"><B><FONT STYLE="white-space:nowrap">1-2328</FONT></B></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top" ALIGN="center"><B><FONT STYLE="white-space:nowrap">36-1124040</FONT></B></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:8pt">
<TD VALIGN="top" ALIGN="center"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>(State or other jurisdiction</B></P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>of incorporation)</B></P></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top" ALIGN="center"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>(Commission File)</B></P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>Number)</B></P></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top" ALIGN="center"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>(IRS Employer</B></P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>Identification No.)</B></P></TD></TR>
</TABLE> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>222 West Adams Street </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>Chicago, Illinois 60606-5314 </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>(Address of principal executive offices, including zip code) </B></P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>(312) <FONT STYLE="white-space:nowrap">621-6200</FONT> </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>(Registrant&#146;s telephone number, including area code) </B></P>
<P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P><center> <P STYLE="line-height:6.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1.00pt solid #000000;width:21%">&nbsp;</P></center>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Check the appropriate box below if the Form <FONT STYLE="white-space:nowrap">8-K</FONT> filing is intended to simultaneously satisfy the obligation of the
registrant under any of the following provisions: </P> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR style = "page-break-inside:avoid">
<TD WIDTH="4%" VALIGN="top" ALIGN="left">&#9744;</TD>
<TD ALIGN="left" VALIGN="top">Written communication pursuant to Rule 425 under the Securities Act (17 CFR 230.425) </TD></TR></TABLE> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR style = "page-break-inside:avoid">
<TD WIDTH="4%" VALIGN="top" ALIGN="left">&#9744;</TD>
<TD ALIGN="left" VALIGN="top">Soliciting material pursuant to Rule <FONT STYLE="white-space:nowrap">14a-12</FONT> under the Exchange Act (17 CFR <FONT STYLE="white-space:nowrap">240.14a-12)</FONT> </TD></TR></TABLE>
<P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR style = "page-break-inside:avoid">
<TD WIDTH="4%" VALIGN="top" ALIGN="left">&#9744;</TD>
<TD ALIGN="left" VALIGN="top"><FONT STYLE="white-space:nowrap">Pre-commencement</FONT> communications pursuant to Rule <FONT STYLE="white-space:nowrap">14d-2(b)</FONT> under the Exchange Act (17 CFR
<FONT STYLE="white-space:nowrap">240.14d-2(b))</FONT> </TD></TR></TABLE> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR style = "page-break-inside:avoid">
<TD WIDTH="4%" VALIGN="top" ALIGN="left">&#9744;</TD>
<TD ALIGN="left" VALIGN="top"><FONT STYLE="white-space:nowrap">Pre-commencement</FONT> communications pursuant to Rule <FONT STYLE="white-space:nowrap">13e-4(c)</FONT> under the Exchange Act (17 CFR
<FONT STYLE="white-space:nowrap">240.13e-4(c))</FONT> </TD></TR></TABLE> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Indicate by check mark whether the registrant is an emerging growth company as
defined in Rule 405 of the Securities Act of 1933 (&#167;230.405 of this chapter) or Rule <FONT STYLE="white-space:nowrap">12b-2</FONT> of the Securities Exchange Act of 1934 <FONT STYLE="white-space:nowrap">(&#167;240.12b-2</FONT> of this chapter).
</P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Emerging growth company&nbsp;&nbsp;&#9744; </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">If an emerging
growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section&nbsp;13(a) of the Exchange
Act.&nbsp;&nbsp;&#9744; </P> <P STYLE="font-size:10pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P> <P STYLE="line-height:1.0pt;margin-top:0pt;margin-bottom:0pt;border-bottom:1px solid #000000">&nbsp;</P>
<P STYLE="line-height:3.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1px solid #000000">&nbsp;</P>

<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">

 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"><B>ITEM&nbsp;1.01 Entry Into A Material Definitive Agreement </B></P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">GATX Corporation (&#147;GATX&#148;) entered into an Underwriting Agreement (the &#147;Underwriting Agreement&#148;), with Citigroup Global Markets Inc. and
Merrill Lynch, Pierce, Fenner&nbsp;&amp; Smith Incorporated, as representatives of the several underwriters listed therein (collectively, the &#147;Underwriters&#148;), dated May&nbsp;3, 2018, pursuant to which GATX agreed to sell and the
Underwriters agreed to purchase, subject to and upon terms and conditions set forth therein, $300,000,000 aggregate principal amount of 4.550% Senior Notes due 2028 (the &#147;Notes&#148;), as described in the prospectus supplement, dated
May&nbsp;3, 2018 (the &#147;Prospectus Supplement&#148;), filed pursuant to GATX&#146;s shelf registration statement on Form <FONT STYLE="white-space:nowrap">S-3,</FONT> Registration <FONT STYLE="white-space:nowrap">No.&nbsp;333-213160</FONT> (the
&#147;Registration Statement&#148;). </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">The Notes will be issued under the Indenture, dated as of February&nbsp;6, 2008, between GATX and U.S. Bank National
Association, as trustee, and officers&#146; certificates providing for the issuance of the Notes. The Underwriters are expected to deliver the Notes against payment on May&nbsp;7, 2018. </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Copies of the Underwriting Agreement and other documents relating to this transaction are attached as exhibits to this Current Report on Form <FONT
STYLE="white-space:nowrap">8-K</FONT> and are incorporated herein by reference. </P> <P STYLE="margin-top:18pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"><B>ITEM&nbsp;2.03. Creation of a Direct Financial Obligation or an
Obligation under an <FONT STYLE="white-space:nowrap">Off-Balance</FONT> Sheet Arrangement of a Registrant </B></P> <P STYLE="margin-top:6pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">See Item 1.01 </P>
<P STYLE="margin-top:18pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"><B>ITEM&nbsp;9.01 Financial Statements and Exhibits </B></P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(d) Exhibits. </P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="100%" BORDER="0" STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" ALIGN="center">


<TR>
<TD></TD>
<TD VALIGN="bottom" WIDTH="3%"></TD>
<TD WIDTH="94%"></TD></TR>


<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" NOWRAP>&nbsp;&nbsp;1.1</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top"><A HREF="d550501dex11.htm">Underwriting Agreement, dated May&nbsp;3, 2018, between GATX and Citigroup Global Markets Inc. and Merrill Lynch, Pierce, Fenner&nbsp;
&amp; Smith Incorporated, as representatives of the several underwriters named therein.</A></TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" NOWRAP>&nbsp;&nbsp;5.1</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top"><A HREF="d550501dex51.htm">Opinion of Mayer Brown LLP as to the validity of the securities being offered. </A></TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" NOWRAP>23.1</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top"><A HREF="d550501dex51.htm">Consent of Mayer Brown LLP (contained in Exhibit 5.1 hereto). </A></TD></TR>
</TABLE>

<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">

 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>SIGNATURE </B></P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned,
thereunto duly authorized. </P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P><DIV ALIGN="right">
<TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="40%" BORDER="0" STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt">


<TR>
<TD WIDTH="100%"></TD></TR>


<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:1pt; border-bottom:1px solid #000000; font-size:10pt; font-family:Times New Roman" ALIGN="center">GATX CORPORATION</P></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" ALIGN="center">(Registrant)</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="16"></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:1pt; border-bottom:1px solid #000000; font-size:10pt; font-family:Times New Roman">/s/ Robert C. Lyons</P></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" ALIGN="center"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">Robert C. Lyons</P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">Executive Vice President, Chief</P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">Financial Officer</P> <P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">(Duly Authorized
Officer)</P></TD></TR>
</TABLE></DIV> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Date: May&nbsp;4, 2018 </P>
</BODY></HTML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-1.1
<SEQUENCE>2
<FILENAME>d550501dex11.htm
<DESCRIPTION>EX-1.1
<TEXT>
<HTML><HEAD>
<TITLE>EX-1.1</TITLE>
</HEAD>
 <BODY BGCOLOR="WHITE">

 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="right"><B>E<SMALL>XHIBIT</SMALL> 1.1 </B></P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="right"><B>EXECUTION VERSION </B></P>
<P STYLE="margin-top:24pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>$300,000,000 </B></P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>GATX
CORPORATION </B></P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>4.550% SENIOR NOTES DUE 2028 </B></P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>UNDERWRITING AGREEMENT&nbsp;&nbsp;&nbsp;&nbsp; </B></P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="right">May&nbsp;3, 2018 </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Citigroup Global Markets Inc.
</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">388 Greenwich Street </P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">New York, New York 10013 </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Merrill Lynch, Pierce, Fenner&nbsp;&amp; Smith </P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; text-indent:8%; font-size:10pt; font-family:Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Incorporated </P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">One Bryant Park </P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">New York, New York 10036 </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">As Representatives of the Underwriters </P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">&nbsp;&nbsp;Listed in
Schedule I hereto </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Ladies and Gentlemen: </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:13%; font-size:10pt; font-family:Times New Roman">GATX Corporation, a New York corporation (the &#147;<U>Company</U>&#148;), proposes to issue and sell to the several Underwriters listed in
Schedule&nbsp;I hereto (the &#147;<U>Underwriters</U>&#148;) for whom you are acting as representatives (the &#147;<U>Representatives</U>&#148;) $300,000,000 aggregate principal amount of its 4.550% Senior Notes due 2028 (the
&#147;<U>Securities</U>&#148;). The Securities will be issued pursuant to the provisions of an Indenture dated as of February&nbsp;6, 2008 between the Company, as issuer, and U.S. Bank National Association, as Trustee (the
&#147;<U>Indenture</U>&#148;) and an Officer&#146;s Certificate to be dated on or about May&nbsp;7, 2018. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:13%; font-size:10pt; font-family:Times New Roman">This is to confirm our
agreement concerning the Underwriters&#146; purchase of the Securities in the respective aggregate principal amounts set forth in Schedule&nbsp;I hereto. </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:13%; font-size:10pt; font-family:Times New Roman">The Company has filed with the Securities and Exchange Commission (the &#147;<U>Commission</U>&#148;) an automatic shelf registration
statement including a prospectus relating to the Securities under the Securities Act of 1933, as amended (the &#147;<U>Securities Act</U>&#148;). The term &#147;<U>Registration Statement</U>&#148; means the Registration Statement on Form <FONT
STYLE="white-space:nowrap">S-3</FONT> (Reg. <FONT STYLE="white-space:nowrap">No.&nbsp;333-213160),</FONT> including the exhibits and schedules thereto, as amended to the date of this Underwriting Agreement (the &#147;<U>Agreement</U>&#148;), and any
Prospectus deemed part of such registration statement pursuant to Rule&nbsp;430B under the Securities Act, as amended on each Effective Date (as defined below), and, in the event any post-effective amendment thereto becomes effective prior to the
Closing Date, shall also mean such registration statement as so amended, as the case may be. The term &#147;<U>Basic Prospectus</U>&#148; means the prospectus included in the Registration Statement, as amended to the date of this Agreement. The term
&#147;<U>Prospectus</U>&#148; means the </P>

<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">

 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">
Basic Prospectus together with the prospectus supplement specifically relating to the Securities (the &#147;<U>Prospectus Supplement</U>&#148;), as filed with, or transmitted for filing to, the
Commission after the Execution Time (as defined below) pursuant to Rule&nbsp;424 under the Securities Act. The term &#147;<U>preliminary prospectus</U>&#148; means a preliminary prospectus supplement specifically referring to the Securities,
together with the Basic Prospectus, which is used prior to the filing of the Prospectus. As used herein, the terms &#147;Registration Statement,&#148; &#147;Basic Prospectus,&#148; &#147;Prospectus&#148; and &#147;preliminary prospectus&#148; shall
include in each case the documents, if any, incorporated by reference therein. The term &#147;<U>Issuer Free Writing Prospectus</U>&#148; means an issuer free writing prospectus, as defined in Rule&nbsp;433 under the Securities Act. The term
&#147;<U>Free Writing Prospectus</U>&#148; means a free writing prospectus, as defined in Rule&nbsp;405 under the Securities Act. The term &#147;<U>Disclosure Package</U>&#148; shall mean the preliminary prospectus, all Issuer Free Writing
Prospectuses, if any, identified on Schedule&nbsp;II hereto, the final term sheet prepared and filed pursuant to Section&nbsp;6(b) below, and all other Free Writing Prospectus that the parties hereto shall hereafter expressly agree in writing to
treat as part of the Disclosure Package. The term &#147;supplement,&#148; &#147;amendment&#148; and &#147;amend&#148; as used herein shall include all documents deemed to be incorporated by reference in the Registration Statement, the Prospectus,
the preliminary prospectus or any Issuer Free Writing Prospectus that are filed subsequent to the date of the Basic Prospectus by the Company with the Commission pursuant to the Securities Exchange Act of 1934, as amended (the &#147;<U>Exchange
Act</U>&#148;). The term &#147;<U>Effective Date</U>&#148; means each date and time that the Registration Statement, and any post-effective amendment or amendments thereto became or becomes effective. The term &#147;<U>Execution Time</U>&#148; shall
mean the date and time that this Agreement is executed and delivered by the parties thereto. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">1. The Company represents and
warrants to and agrees with each of the Underwriters that: </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(a) The Company has prepared and filed with the Commission the Registration
Statement, including the Basic Prospectus, for registration under the Securities Act of the offering and sale of the Securities. Such Registration Statement became effective upon filing; no stop order suspending the effectiveness of the Registration
Statement is in effect, and no proceedings for such purpose are pending before or, to the Company&#146;s knowledge, threatened by the Commission. The Company has filed with the Commission, as part of an amendment to the Registration Statement or
pursuant to Rule 424(b) under the Securities Act, a preliminary prospectus supplement relating to the Securities. The Company will file with the Commission a final prospectus supplement relating to the Securities in accordance with Rule 424(b) under
the Securities Act. As filed, such final prospectus supplement shall contain all information required by the Securities Act and the rules and regulations of the Commission thereunder. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(b) (i)&nbsp;Each document, if any, filed or to be filed pursuant to the Exchange Act and incorporated by reference in the Disclosure Package
and the Prospectus, complied or will comply when so filed in all material respects with the Exchange Act and the rules and regulations of the Commission thereunder and will be timely filed as required thereby, (ii)&nbsp;each part of the Registration
Statement, when such part became effective, did not contain and each such part, as amended or supplemented, if applicable, will not contain any untrue statement of a material fact or omit to state a material fact required to be stated therein or
necessary to make the statements therein not misleading, (iii)&nbsp;the Registration Statement, on the latest Effective Date, and the Prospectus, as of its date, complied and, as amended or supplemented, if applicable, will comply in all material
respects with the Securities Act, the Exchange Act, the Trust Indenture Act of 1939, as amended (the &#147;<U>Trust Indenture Act</U>&#148;) and the applicable rules and regulations of the Commission thereunder, (iv)&nbsp;the Prospectus, as of its
date, did not contain and as of the Closing Date, as amended or supplemented, if applicable, will not contain any untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary to make the statements
therein, in the light of the circumstances under which they were made, not misleading, and (v)&nbsp;the Disclosure Package, as of the Execution Time, does not contain any untrue statement of a material fact or omit to state any material fact
necessary in order to make the statements therein, in the light of the </P>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">2 </P>


<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">

 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">
circumstances under which they were made, not misleading; provided that the representations and warranties set forth in this Section&nbsp;1(b) do not apply (x)&nbsp;to statements or omissions in
the Registration Statement, the Disclosure Package or the Prospectus based upon information concerning the Underwriters furnished to the Company in writing by the Underwriters expressly for use therein, it being understood and agreed that the only
such information furnished to the Company consists of the information described as such in Section&nbsp;8(b) below, or (y)&nbsp;to that part of the Registration Statement that constitutes the Statement of Eligibility and Qualification (Form <FONT
STYLE="white-space:nowrap">T-1)</FONT> under the Trust Indenture Act, of the Trustee. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(c) At the earliest time after the filing of the
Registration Statement that the Company or other offering participant made a<I> bona fide</I> offer (within the meaning of Rule&nbsp;164(h)(2) under the Securities Act) of the Securities, the Company was not and is not an Ineligible Issuer (as
defined in Rule&nbsp;405 under the Securities Act), without taking account of any determination by the Commission pursuant to Rule&nbsp;405 under the Securities Act that it is not necessary that the Company be considered an Ineligible Issuer. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(d) Each Issuer Free Writing Prospectus and the final term sheet prepared and filed pursuant to Section&nbsp;6(b) below does not include any
information that conflicts with the information contained or incorporated by reference in the Registration Statement, including any prospectus supplement deemed to be a part thereof that has not been superseded or modified, it being understood and
agreed that the foregoing does not apply to statements in or omissions from any Issuer Free Writing Prospectus based upon and in conformity with written information furnished to the Company by the Underwriters, it being understood and agreed that
the only such information furnished to the Company by the Underwriters consists of the information described as such in Section&nbsp;8(b) below. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(e) (i)&nbsp;At the time of filing the Registration Statement, (ii)&nbsp;at the time of the most recent amendment thereto for the purposes of
complying with Section&nbsp;10(a)(3) of the Securities Act (whether such amendment was by post-effective amendment, incorporated report filed pursuant to Sections&nbsp;13 or 15(d) of the Exchange Act or form of prospectus), (iii)&nbsp;at the time
the Company or any person acting on its behalf (within the meaning, for this clause only, of Rule 163(c) under the Securities Act) made any offer relating to the Securities in reliance on the exemption in Rule&nbsp;163, and (iv)&nbsp;at the
Execution Time (with such date being used as the determination date for purposes of this clause (iv)) the Company was or is (as the case may be) a &#147;well-known seasoned issuer&#148; as defined in Rule&nbsp;405 under the Securities Act. The
Company agrees to pay the fees required by the Commission relating to the Securities within the time required by Rule 456(b)(1) under the Securities Act without regard to the proviso therein and otherwise in accordance with Rules 456(b) and 457(r)
under the Securities Act. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(f) The Company has been duly incorporated, is validly existing as a corporation in good standing under the laws
of the State of New York, has the corporate power and authority to own its property and to conduct its business as described in the Disclosure Package and the Prospectus, and is duly qualified to transact business and is in good standing in each
jurisdiction in which the conduct of its business or its ownership or leasing of property requires such qualification, except to the extent that the failure to be so qualified or be in good standing would not, individually or in the aggregate,
reasonably be expected to have a Material Adverse Effect (as defined below). </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(g) Each subsidiary of the Company that is a
&#147;significant subsidiary&#148; as defined in Rule&nbsp;405 under the Securities Act (a &#147;<U>Significant Subsidiary</U>&#148;) has been duly incorporated, is validly existing as a corporation in good standing under the laws of the
jurisdiction of its incorporation, has the corporate power and authority to own its property and to conduct its business as described in the Disclosure Package and the Prospectus, and is duly qualified to transact business and is in good standing in
each jurisdiction in which the conduct of its business or its ownership or leasing of property requires such qualification, except to the extent that the failure to be so qualified or be in good standing would not, individually or in the aggregate,
reasonably be expected to have a Material Adverse Effect. </P>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">3 </P>


<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">

 <P STYLE="margin-top:0pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(h) This Agreement has been duly authorized, executed and delivered by the Company. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(i) The Indenture has been duly authorized, executed and delivered by the Company and, assuming the due authorization, execution and delivery
by the Trustee, constitutes a valid and binding agreement of the Company enforceable in accordance with its terms except as the enforceability thereof may be limited by (i)&nbsp;bankruptcy, insolvency, reorganization, moratorium, fraudulent
conveyance or other similar laws affecting creditor&#146;s rights and remedies generally from time to time in effect and (ii)&nbsp;general principles of equity (whether considered in a proceeding in equity or at law) and an implied covenant of good
faith and fair dealing (the &#147;<U>Enforceability Exceptions</U>&#148;). The Indenture has been duly qualified under the Trust Indenture Act and will conform in all material respects to the descriptions thereof in the Disclosure Package and the
Prospectus. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(j) The Securities have been duly authorized and, when executed and authenticated in accordance with the provisions of the
Indenture and delivered to and duly paid for by the Underwriters, as provided in this Agreement, will conform in all material respects to the descriptions thereof in the Disclosure Package and the Prospectus, will be entitled to the benefits of the
Indenture and will be valid and legally binding obligations of the Company, enforceable against the Company in accordance with their terms except as the enforceability thereof may be limited by the Enforceability Exceptions. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(k) The execution and delivery by the Company of, and the performance by the Company of its obligations under, this Agreement and the Indenture
and the issuance and sale of the Securities by the Company will not (i)&nbsp;constitute a default under any indenture, mortgage, deed of trust, loan agreement or other agreement or instrument to which the Company or any of its subsidiaries is a
party or by which the Company or any of its subsidiaries is bound or to which any of the property or assets of the Company or any of its subsidiaries is subject (each, an &#147;<U>Existing Instrument</U>&#148;), (ii)&nbsp;result in any violation of
the certificate of incorporation or bylaws of the Company, (iii)&nbsp;conflict with or constitute a breach of, or default under, or result in the creation or imposition of any lien, charge or encumbrance upon any of the property or assets of the
Company or any of its subsidiaries pursuant to any Existing Instrument or (iv)&nbsp;result in any violation of any law, regulation, judgment, order or decree of any governmental body, agency or court having jurisdiction over the Company or any of
its subsidiaries, except in each case of clauses (i), (iii) and (iv), for such defaults, conflicts, breaches, liens, charges, encumbrances or violations as would not, individually or in the aggregate, reasonably be expected to have a Material
Adverse Effect; and, to the best of the Company&#146;s knowledge, no consent, approval or authorization of any governmental body or agency is required for the performance by the Company of its obligations under this Agreement, the Indenture or the
Securities, except such as have been or will be obtained prior to the Closing Date under the Securities Act, the Exchange Act and the Trust Indenture Act and such as may be required under the securities or Blue Sky laws of the various states in
connection with the offer and sale of the Securities. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(l) Since the date of the most recent audited financial statements in the Disclosure
Package and the Prospectus, there has not been any material adverse change, or any development that would reasonably be expected to result in a material adverse change, in the financial condition, stockholders&#146; equity, results of operations,
business or properties of the Company and its subsidiaries, taken as a whole, whether or not arising in the ordinary course of business (referred to as a &#147;<U>Material Adverse Change</U>&#148; or &#147;<U>Material Adverse Effect</U>&#148;) from
that set forth in the Disclosure Package and the Prospectus. </P>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">4 </P>


<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">

 <P STYLE="margin-top:0pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(m) There are no legal or governmental proceedings pending or, to the best of the Company&#146;s
knowledge, threatened to which the Company or any of its subsidiaries is a party or to which any of the properties of the Company or any of its subsidiaries is subject that are required to be described in the Registration Statement or the Disclosure
Package or the Prospectus and are not so described or, to the best of the Company&#146;s knowledge, any statutes, regulations, contracts or other documents that are required to be described in the Registration Statement, the Disclosure Package or
the Prospectus or to be filed as an exhibit to the Registration Statement that are not described or filed as required. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(n) The Company and
each of its Significant Subsidiaries have all necessary consents, authorizations, approvals, orders, certificates and permits of and from, and have made all declarations and filings with, all federal, state, local and other governmental authorities,
all self-regulatory organizations and all courts and other tribunals, to own, lease, license and use its properties and assets and to conduct their business in the manner described in the Disclosure Package and the Prospectus, as then amended or
supplemented, except to the extent that the failure to obtain or file would not reasonably be expected to have a Material Adverse Effect. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(o) Ernst&nbsp;&amp; Young LLP, whose reports have been included or incorporated by reference in the Disclosure Package and the Prospectus, is
an independent registered public accounting firm within the applicable rules and regulations adopted by the Commission and the Public Accounting Oversight Board (United States) and as required by the Securities Act and the rules and regulations
thereunder. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(p) The financial statements included or incorporated by reference in the Registration Statement, the Disclosure Package and
the Prospectus present fairly in all material respects the financial condition and results of operations of the Company and its subsidiaries taken as a whole, at the dates and for the periods indicated, and have been prepared in conformity with
generally accepted accounting principles applied on a consistent basis throughout the periods involved. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(q) The Company is not and, after
giving effect to the offering and sale of the Securities and the application of the proceeds thereof as described in the Disclosure Package and the Prospectus, the Company will not be required to register as, an &#147;investment company&#148; as
such term is defined in the Investment Company Act of 1940, as amended. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(r) The Company and its subsidiaries maintain a system of internal
control over financial reporting (as such term is defined in <FONT STYLE="white-space:nowrap">Rule&nbsp;13a-15(f)</FONT> under the Exchange Act) and are not aware of any material weakness in their internal controls over financial reporting. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(s) The Company and its subsidiaries maintain &#147;disclosure controls and procedures&#148; (as such term is defined in <FONT
STYLE="white-space:nowrap">Rule&nbsp;13a-15(e)</FONT> under the Exchange Act); such disclosure controls and procedures are effective. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(t)
The Company will not use the proceeds of the sale of the Securities hereunder, or lend, contribute or otherwise make available such proceeds to any subsidiary, joint venture partner, or other individual or entity directly or, the knowledge of the
Company, indirectly for the purpose of funding or facilitating any activities or business of or with any individual or entity (including ships or aircraft), or in any country or territory, that, at the time of such funding or facilitation, is the
subject of any sanctions administered or enforced by the Office of Foreign Assets Control of the U.S. Department of the Treasury, the U.S. Department of State, the Bureau of Industry and Security of the U.S. Department of Commerce, or other relevant
sanctions authority. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(u) The Company and its subsidiaries are (i)&nbsp;in compliance with any and all applicable foreign, federal, state
and local laws and regulations relating to the protection of human health and safety, the environment or hazardous or toxic substances or wastes, pollutants or contaminants (&#147;<U>Environmental Laws</U>&#148;), (ii)&nbsp;have received and are in
compliance with all permits, licenses or other approvals required of </P>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">5 </P>


<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">

 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">
them under applicable Environmental Laws to conduct their respective businesses and (iii)&nbsp;have not received notice of any actual or potential liability under any environmental law, except
where such <FONT STYLE="white-space:nowrap">non-compliance</FONT> with Environmental Laws, failure to receive required permits, licenses or other approvals, or liability would not, individually or in the aggregate, have a Material Adverse Change,
except as set forth in or contemplated in the Disclosure Package and the Prospectus (exclusive of any supplement thereto). </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:17%; font-size:10pt; font-family:Times New Roman">2. The Company
agrees to issue and sell the Securities to the Underwriters as hereinafter provided, and each Underwriter, upon the basis of the representations and warranties herein contained and subject to the conditions hereinafter stated, agrees, severally and
not jointly, to purchase from the Company the aggregate principal amount of Securities set forth opposite such Underwriter&#146;s name in Schedule&nbsp;I hereto at the purchase price (the &#147;<U>Purchase Price</U>&#148;) in U.S. Dollars equal to
100.000% of the principal amount of the Securities, plus accrued and unpaid interest thereon, if any, from the &#147;Closing Date&#148; (as defined in Section&nbsp;4 hereof) to the date of payment and delivery. The Company agrees to pay to Citigroup
Global Markets Inc. and Merrill Lynch, Pierce, Fenner&nbsp;&amp; Smith Incorporated (on behalf of the Underwriters) an aggregate commission equal to 0.650% (65 basis points) on the aggregate principal amount of Securities purchased hereunder. Such
payment shall be made simultaneously with the payment by the Underwriters of the Purchase Price as set forth in Section&nbsp;4. Payment of such compensation shall be made by Federal funds check or other immediately available funds to the order of
Merrill Lynch, Pierce, Fenner&nbsp;&amp; Smith Incorporated on behalf of the Underwriters. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:17%; font-size:10pt; font-family:Times New Roman">3. The Company is advised by the
Representatives that the Underwriters propose to make a public offering of their respective portions of the Underwriters&#146; Securities as soon after this Agreement is entered into as in the Representatives&#146; judgment is advisable. The terms
of the public offering of the Underwriters&#146; Securities are set forth in the Disclosure Package and the Prospectus. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:17%; font-size:10pt; font-family:Times New Roman">4. Payment for
the Securities by the Underwriters shall be made by wire transfer in immediately available funds to the account specified by the Company to the Representatives on or about May&nbsp;7, 2018 or at such other time on the same or such other date, as the
Representatives and the Company may agree upon in writing. The time and date of such payment and delivery for the Securities are referred to herein as the &#147;<U>Closing Date</U>.&#148; As used herein, the term &#147;<U>Business Day</U>&#148;
means any day other than a day on which banks are permitted or required to be closed in New York City. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:13%; font-size:10pt; font-family:Times New Roman">Payment for the Securities shall
be made against delivery of one or more global certificates for the Securities, each of which will be deposited with U.S. Bank National Association, as custodian for DTC and registered in the name of a nominee of DTC. Forms of such certificates will
be made available for inspection by the Underwriters at Mayer Brown LLP, not later than 12:00 p.m., New York, New York time, or at such other location as the Representatives and the Company shall agree, on the Business Day prior to the Closing Date.
</P> <P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:17%; font-size:10pt; font-family:Times New Roman">5. The several obligations of the Underwriters hereunder are subject to the accuracy of the representations and warranties on the part of
the Company contained herein as of the Execution Time and the Closing Date, to the accuracy of the statements of the Company made in any certificates pursuant to the provisions hereof, to the performance by the Company of its obligations hereunder
and to the following additional conditions: </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(a) Subsequent to the execution and delivery of this Agreement and prior to the Closing Date:
</P> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR style = "page-break-inside:avoid">
<TD WIDTH="20%">&nbsp;</TD>
<TD WIDTH="6%" VALIGN="top" ALIGN="left">(i)</TD>
<TD ALIGN="left" VALIGN="top">there shall not have been any downgrading in the rating accorded the Company or any of the Company&#146;s securities or in the rating outlook for the Company by Moody&#146;s or S&amp;P or any notice given of any
intended or potential decrease in any such rating or of a possible change in any such rating or such rating outlook; and </TD></TR></TABLE>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">6 </P>


<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">


<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR style = "page-break-inside:avoid">
<TD WIDTH="20%">&nbsp;</TD>
<TD WIDTH="6%" VALIGN="top" ALIGN="left">(ii)</TD>
<TD ALIGN="left" VALIGN="top">there shall not have occurred any Material Adverse Change, or any development reasonably likely to result in a Material Adverse Change, from that set forth in the Disclosure Package (exclusive of any amendments or
supplements thereto subsequent to the date of this Agreement) that, in the reasonable judgment of the Representatives, is material and adverse and that makes it, in the reasonable judgment of the Representatives, impracticable to market the
Securities on the terms and in the manner contemplated in the Disclosure Package. </TD></TR></TABLE> <P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(b) The Representatives shall have
received on the Closing Date an opinion from Peter J. Falconer, Associate General Counsel of GATX Corporation, dated the Closing Date, in form and substance satisfactory to the Representatives, to the effect set forth in Exhibit&nbsp;A hereto. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(c) The Representatives shall have received on the Closing Date an opinion, dated the Closing Date, of Mayer Brown LLP, counsel for the
Company, in form and substance satisfactory to the Representatives, to the effect set forth in Exhibit&nbsp;B hereto. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(d) The
Representatives shall have received on the Closing Date an opinion of Winston&nbsp;&amp; Strawn LLP, counsel for the Underwriters, dated the Closing Date, with respect to the issuance and sale of the Securities, the Indenture, the Registration
Statement, the Disclosure Package, the Prospectus (together with any supplement thereto) and other related matters as the Representatives may reasonably require, and the Company shall have furnished to such counsel such documents as they request for
the purpose of enabling them to pass upon such matters. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(e) The Representatives shall have received, on the Closing Date a certificate,
dated the Closing Date, and signed by an executive officer of the Company, to the effect set forth in Section&nbsp;5(a)(i) above and to the effect that (i)&nbsp;the representations and warranties of the Company contained in this Agreement are true
and correct as of the Closing Date; (ii)&nbsp;the Company has complied with all of the agreements and satisfied all of the conditions on its part to be performed or satisfied hereunder on or before the Closing Date; (iii)&nbsp;since the date of the
most recent financial statements included or incorporated by reference in the Disclosure Package and in the Prospectus, as amended or supplemented as of the Execution Time, there has been no Material Adverse Change from that set forth in the
Disclosure Package, as so amended or supplemented and in the Prospectus; and (iv)&nbsp;no stop order suspending the effectiveness of the Registration Statement has been issued and no proceedings for that purpose have been instituted or, to the
Company&#146;s knowledge, threatened. The officer signing and delivering such certificate may rely upon the best of his or her knowledge as to proceedings threatened. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(f) The Representatives shall have received on the date hereof and confirmed on the Closing Date a letter dated the date hereof or the Closing
Date, as applicable, in form and substance reasonably satisfactory to the Representatives, from Ernst&nbsp;&amp; Young LLP, independent registered public accounting firm of the Company, containing statements and information of the type ordinarily
included in accountants&#146; &#147;comfort letters&#148; to underwriters with respect to the financial statements and certain financial information contained in or incorporated by reference into the Registration Statement, the Disclosure Package
and the Prospectus. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(g) If filing of the Prospectus, or any supplement thereto, is required pursuant to Rule 424(b) under the Securities
Act, the Prospectus and any such supplement shall have been filed in the manner and within the time period required by Rule&nbsp;424(b); the final term sheet contemplated by Section&nbsp;6(b) hereof, and any other material required to be filed by
the Company pursuant to Rule 433(d) under the Securities </P>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">7 </P>


<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">

 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">
Act, shall have been filed with the Commission within the applicable time periods prescribed for such filings by Rule&nbsp;433 under the Securities Act; and no stop order suspending the
effectiveness of the Registration Statement shall have been issued and no proceedings for that purpose shall have been instituted or, to the Company&#146;s knowledge, threatened. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(h) On or prior to the Closing Date, the Company shall have furnished to each Underwriter such further certificates and documents as such
Underwriter shall reasonably request pursuant to Section&nbsp;6(i) below. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:17%; font-size:10pt; font-family:Times New Roman">6. In further consideration of the agreements of the
Underwriters contained in this Agreement, the Company covenants as follows: </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(a) Prior to the termination of the offering of the Securities
pursuant to this Agreement, the Company will not file any amendment or supplement to the Registration Statement or the Basic Prospectus (including any Prospectus Supplement relating to the Securities) unless the Company has previously furnished to
the Representatives a copy thereof for its review and will not file any such proposed amendment or supplement to which the Representatives reasonably object; provided that the foregoing requirement shall not apply to any of the Company&#146;s
periodic filings with the Commission required to be filed pursuant to Section&nbsp;13(a), 13(c), 14 or&nbsp;15(d) of the Exchange Act, which filings the Company will cause to be timely filed with the Commission and copies of which filings the
Company will cause to be delivered to the Representatives upon written request therefor promptly after being filed with the Commission. Subject to the foregoing sentence, the Company will promptly cause each Prospectus Supplement to be filed with
the Commission in accordance with Rule&nbsp;424(b) under the Securities Act. The Company will promptly advise the Representatives (i)&nbsp;when the Prospectus, and any supplement thereto, shall have been filed (if required) with the Commission
pursuant to Rule 424(b) under the Securities Act, (ii)&nbsp;of the filing of any amendment or supplement to the Basic Prospectus, (iii)&nbsp;of the filing and effectiveness of any amendment to the Registration Statement, (iv)&nbsp;of any request by
the Commission for any amendment of the Registration Statement, or for any amendment of or supplement to the Basic Prospectus or for any additional information, (v)&nbsp;of the issuance by the Commission of any stop order suspending the
effectiveness of the Registration Statement or the institution or threatening of any proceeding for that purpose and (vi)&nbsp;of the receipt by the Company of any notification with respect to the suspension of the qualification of the Securities
for sale in any jurisdiction or the initiation or threatening of any proceeding for such purpose. The Company will use its best efforts to prevent the issuance of any such stop order or notice of suspension of qualification and, if issued, to obtain
as soon as possible the withdrawal of such stop order including, if necessary, by filing an amendment to the Registration Statement or a new registration statement and using its best efforts to have such amendment or new registration statement
declared effective as soon as practicable. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(b) To prepare a final term sheet, containing solely a description of final terms of the
Securities and the offering thereof in the form attached as Schedule&nbsp;III hereto, a copy of which shall be furnished to the Representatives for their review prior to filing. The Company will not file such term sheet without the approval of the
Representatives, which approval shall not be unreasonably withheld. Upon receipt of such approval of the Representatives, the Company shall file such term sheet pursuant to Rule 433(d) under the Securities Act within the time required by such Rule.
</P> <P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(c) If, at any time prior to the filing of the Prospectus Supplement pursuant to Rule 424(b) under the Securities Act, any event occurs as
a result of which the Disclosure Package would include any untrue statement of a material fact or omit to state any material fact necessary to make the statements therein in the light of the circumstances under which they were made not misleading,
the Company will (i)&nbsp;promptly notify the Representatives so that any use of the Disclosure Package may cease until it is amended or supplemented; (ii)&nbsp;subject to the first clause of the first sentence of paragraph (a)&nbsp;of this
Section&nbsp;6, amend or supplement the Disclosure Package to correct such statement or omission; and (iii)&nbsp;supply any amendment or supplement to the Representatives in such quantities as the Representatives may reasonably request. </P>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">8 </P>


<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">

 <P STYLE="margin-top:0pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(d) If, at any time when a prospectus relating to the Securities is required to be delivered
under the Securities Act (including in circumstances where such requirement may be satisfied pursuant to Rule&nbsp;172), or until the distribution of any Securities an Underwriter may own as principal has been completed, any event occurs or
condition exists as a result of which (i)&nbsp;the Registration Statement or the Prospectus as then amended or supplemented would include an untrue statement of a material fact, or omit to state any material fact required to be stated therein or
necessary to make the statements therein, in the light of the circumstances under which they were made at such time, not misleading, or (ii)&nbsp;if, in the opinion of the Representatives or in the opinion of the Company, it is necessary at any time
to amend or supplement the Registration Statement or the Prospectus, as then amended or supplemented, to comply with applicable law, the Company will immediately notify each Underwriter by telephone (with confirmation in writing) to suspend
solicitation of offers to purchase Securities or any resale thereof and, if so notified by the Company, each Underwriter shall forthwith suspend such solicitation or resale and cease using the Prospectus as then amended or supplemented. The Company
shall, at its expense, prepare and cause to be filed promptly with the Commission, subject to the first sentence of paragraph (a)&nbsp;of this Section&nbsp;6, an amendment or supplement to the Registration Statement or Prospectus as then amended or
supplemented that will correct such statement or omission or effect such compliance and will supply such amended or supplemented Prospectus to each Underwriter in such quantities as such Underwriter may reasonably request. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(e) The Company will make generally available to its security holders and to the Representatives as soon as practicable earnings statements
that satisfy the provisions of Section&nbsp;11(a) of the Securities Act and the rules and regulations of the Commission thereunder covering the twelve-month period beginning, in each case, not later than the first day of the Company&#146;s fiscal
quarter next following the date of the Underwriting Agreement. If such fiscal quarter is the last fiscal quarter of the Company&#146;s fiscal year, such earnings statement shall be made available not later than 90&nbsp;days after the close of the
period covered thereby and in all other cases shall be made available not later than 45&nbsp;days after the close of the period covered thereby. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(f) The Company will furnish to the Representatives without charge three copies of the Registration Statement and all amendments thereto,
including to the extent requested by the Representatives in writing, exhibits, schedules and any documents incorporated by reference therein, and, during the period mentioned in Section&nbsp;6(d) above, as many copies of the Prospectus (including
any preliminary prospectus) and each Issuer Free Writing Prospectus (and any supplements thereto), any documents incorporated by reference therein and any supplements and amendments thereto as the Representatives may reasonably request. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(g) The Company will qualify the Securities for offer and sale under the securities or Blue Sky laws of such jurisdictions as the
Representatives shall reasonably request and will pay all reasonable expenses (including fees and disbursements of counsel) in connection with such qualification and in connection with the determination of the eligibility of the Securities for
investment under the laws of such jurisdictions as the Representatives may designate, provided that the Company shall not be obligated to so qualify the Securities if such qualification subjects it to taxation in respect of doing business in any
jurisdiction in which it is not otherwise subject, or requires it to file any general consent to service of process or qualify as a foreign corporation in any jurisdiction in which it is not so qualified. </P>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">9 </P>


<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">

 <P STYLE="margin-top:0pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(h) The Company agrees that, unless it has or shall have obtained the prior written consent (not
to be unreasonably withheld) of the Representatives, it has not made and will not make any offer relating to the Securities that would constitute an Issuer Free Writing Prospectus or that would otherwise constitute a &#147;free writing
prospectus&#148; (as defined in Rule&nbsp;405) required to be filed by the Company with the Commission or retained by the Company under Rule&nbsp;433, other than a free writing prospectus containing solely the information contained in the final term
sheet prepared and filed pursuant to Section&nbsp;6(b) hereto; provided that the prior written consent of the Representatives shall be deemed to have been given in respect of the Free Writing Prospectuses included in Schedule&nbsp;IV
hereto.&nbsp;Any such free writing prospectus consented to by the Representatives is hereinafter referred to as a &#147;Permitted Free Writing Prospectus.&#148;&nbsp;The Company agrees that (x)&nbsp;it has treated and will treat, as the case may be,
each Permitted Free Writing Prospectus as an Issuer Free Writing Prospectus and (y)&nbsp;it has complied and will comply, as the case may be, with the requirements of Rules&nbsp;164 and 433 under the Securities Act applicable to any Permitted Free
Writing Prospectus, including in respect of timely filing with the Commission, legending and record keeping. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(i) Prior to the termination
of the offering of the Securities, the Company shall furnish to the Representatives such relevant documents and certificates of officers of the Company relating to the business, operations and affairs of the Company, the Registration Statement, the
Basic Prospectus, any amendments or supplements thereto, the Indenture, the Securities, this Agreement, and the performance by the Company of its obligations hereunder or thereunder as the Representatives may from time to time reasonably request and
shall notify the Representatives promptly in writing when it becomes aware of any downgrading or of its receipt of any notice of (i)&nbsp;any intended or potential downgrading or (ii)&nbsp;any review or possible change that does not indicate the
direction of a possible change in the rating accorded any of the Company&#146;s securities by Moody&#146;s or S&amp;P. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(j) The Company
will, whether or not any sale of Securities is consummated, pay all expenses incident to the performance of its obligations under the Underwriting Agreement, including: (i)&nbsp;the preparation and filing of the Registration Statement, any
preliminary prospectuses, the Prospectus and each Issuer Free Writing Prospectus and all amendments and supplements thereto; (ii)&nbsp;the preparation, issuance and delivery of the Securities; (iii)&nbsp;the fees and disbursements of the
Company&#146;s counsel and accountants and of the Trustee and its counsel; (iv)&nbsp;the qualification of the Securities under securities or Blue Sky laws in accordance with the provisions of Section&nbsp;6(g), including filing fees and the
reasonable fees and disbursements of the counsel for the Underwriters in connection therewith and in connection with the preparation of any Blue Sky memoranda (&#147;<U>Blue Sky Memoranda</U>&#148;); (v)&nbsp;the printing and delivery to the
Underwriters in quantities as hereinabove stated of copies of the Registration Statement and all amendments thereto, the Basic Prospectus and any amendments or supplements thereto and each Issuer Free Writing Prospectus and any amendments or
supplements thereto; (vi)&nbsp;the printing and delivery to the Underwriters of copies of the Indenture and any Blue Sky Memoranda; (vii)&nbsp;any fees charged by rating agencies for the rating of the Securities; (viii)&nbsp;any reasonable <FONT
STYLE="white-space:nowrap"><FONT STYLE="white-space:nowrap">out-of-pocket</FONT></FONT> expenses incurred by the Underwriters with the approval of the Company; and (ix)&nbsp;the fees and expenses, if any, incurred with respect to any filing with the
Financial Industry Regulatory Authority, Inc. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(k) During the period beginning on the date of this Agreement and continuing to and
including the Closing Date, the Company will not, without the prior consent of the Representatives, offer, sell, contract to sell or otherwise dispose of any debt securities of the Company substantially similar to the Securities (other than
(i)&nbsp;the Securities that are to be sold pursuant to this Agreement, (ii)&nbsp;other debt securities previously agreed to be sold by the Company and (iii)&nbsp;commercial paper issued in the ordinary course of business). </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:17%; font-size:10pt; font-family:Times New Roman">7. (a) The Representatives shall promptly notify the Company of the completion of the distribution of the Securities. </P>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">10 </P>


<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">

 <P STYLE="margin-top:0pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(b) Each Underwriter, severally and not jointly, agrees with the Company that, unless it has or
shall have obtained, the prior written consent of the Company, it has not made and will not make any offer relating to the Securities that would constitute an Issuer Free Writing Prospectus or that would otherwise constitute a &#147;free writing
prospectus&#148; (as defined in Rule&nbsp;405) required to be filed by the Company with the Commission or retained by the Company under Rule&nbsp;433, other than a free writing prospectus containing solely the information contained in the final term
sheet prepared and filed pursuant to Section&nbsp;6(b) hereto; provided that the prior written consent of the Company shall be deemed to have been given in respect of the Free Writing Prospectuses included in Schedule&nbsp;IV hereto.</P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:17%; font-size:10pt; font-family:Times New Roman">8. (a) The Company agrees to indemnify and hold harmless each Underwriter, the officers, directors, employees and agents of such Underwriter,
and each person, if any, who controls such Underwriter within the meaning of either Section&nbsp;15 of the Securities Act or Section&nbsp;20 of the Exchange Act, from and against any and all losses, claims, damages or liabilities, joint or several,
caused by or based upon any untrue statement or alleged untrue statement of a material fact contained in the Registration Statement or in any amendment thereof, or in the Prospectus, any preliminary prospectus, any Permitted Free Writing Prospectus
or other free writing prospectus used by the Company or any agent of the Company (other than any Underwriter) or the information contained in the final term sheet as required to be prepared and filed pursuant to Section&nbsp;6(b) hereof, or in any
amendment or supplement to any thereof, or caused by any omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein, not misleading, except insofar as such losses, claims,
damages or liabilities are caused by or based upon any such untrue statement or omission or alleged untrue statement or alleged omission based upon information furnished to the Company in writing by or on behalf of such Underwriter expressly for use
therein. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(b) Each Underwriter agrees, severally and not jointly, to indemnify and hold harmless the Company, its directors, its officers
who sign the Registration Statement and any person who controls the Company within the meaning of either Section&nbsp;15 of the Securities Act or Section&nbsp;20 of the Exchange Act to the same extent as the foregoing indemnity from the Company to
each such Underwriter, but only with reference to information relating to such Underwriter furnished in writing by such Underwriter expressly for use in the Registration Statement or the Prospectus or any amendments or supplements thereto or in any
preliminary prospectus or Permitted Free Writing Prospectus. The Company acknowledges that the statements set forth in the last paragraph of the cover page regarding delivery of the Securities and under the heading &#147;Underwriting,&#148; in
(i)&nbsp;the third paragraph related to discounts, (ii)&nbsp;the fifth paragraph related to stabilization, overallotment, concessions and syndicate covering transactions and (iii)&nbsp;the second sentence of the sixth paragraph related to market
making activities in the preliminary prospectus constitute the only information furnished by or on behalf of the several Underwriters for inclusion in the Registration Statement, the Prospectus, any amendments or supplements thereto or in any
preliminary prospectus or Permitted Free Writing Prospectus. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(c) In case any proceeding (including any governmental investigation) shall
be instituted involving any person in respect of which indemnity may be sought pursuant to either paragraph&nbsp;(a) or&nbsp;(b) above, such person (the &#147;<U>indemnified party</U>&#148;) shall promptly notify the person against whom such
indemnity may be sought (the &#147;<U>indemnifying party</U>&#148;) in writing; and the indemnifying party, upon request of the indemnified party, shall retain counsel reasonably satisfactory to the indemnified party to represent the indemnified
party and any others the indemnifying party may designate in such proceeding and shall pay the reasonable fees and disbursements of such counsel related to such proceeding. In any such proceeding, any indemnified party shall have the right to retain
its own counsel, but the fees and expenses of such counsel shall be at the expense of such indemnified party unless (i)&nbsp;the indemnifying party and the indemnified party shall have mutually agreed to the retention of such counsel, (ii)&nbsp;the
actual or potential parties to any such proceeding (including any impleaded parties) include both the indemnifying party and the indemnified party and the indemnified party shall have reasonably concluded that there may be legal
</P>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">11 </P>


<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">

 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">
defenses available to it and/or other indemnified parties which are different from or additional to those available to the indemnifying party, (iii)&nbsp;the use of counsel chosen by the
indemnifying party to represent the indemnified party would present such counsel with a conflict of interest or (iv)&nbsp;the indemnifying party shall not have employed counsel reasonably satisfactory to the indemnified party to represent the
indemnified party within a reasonable time after notice of the institution of such proceeding. It is understood that the indemnifying party shall not, in connection with any proceeding or related proceedings in the same jurisdiction, be liable for
the fees and expenses of more than one separate firm (in addition to any local counsel) for all such indemnified parties and that all such fees and expenses shall be reimbursed as they are incurred. Such firm shall be designated in writing by the
Representatives, in the case of parties indemnified pursuant to paragraph&nbsp;(a) above and by the Company in the case of parties indemnified pursuant to paragraph&nbsp;(b) above. The indemnifying party shall not be liable for any settlement of any
proceeding effected without its written consent but, if settled with such consent or if there be a final judgment for the plaintiff, the indemnifying party agrees to indemnify the indemnified party from and against any loss or liability by reason of
such settlement or judgment. Notwithstanding the foregoing sentence, if at any time an indemnified party shall have requested an indemnifying party to reimburse the indemnified party for reasonable fees and expenses of counsel as contemplated by the
third sentence of this paragraph, the indemnifying party agrees that it shall be liable for any settlement of any proceeding effected without its written consent if (i)&nbsp;such settlement is entered into more than 30&nbsp;days after receipt by
such indemnifying party of the aforesaid request and (ii)&nbsp;such indemnifying party shall not have reimbursed the indemnified party in accordance with such request prior to the date of such settlement. No indemnifying party shall, without the
prior written consent of the indemnified party, effect any settlement of any pending or threatened proceeding in respect of which any indemnified party is or could have been a party and indemnity could have been sought hereunder by such indemnified
party unless such settlement includes an unconditional release of such indemnified party from all liability on claims that are the subject matter of such proceeding. Failure to notify the indemnifying party as required by the first sentence of this
paragraph&nbsp;(c)&nbsp;(1) will not relieve the indemnifying party from liability under paragraph&nbsp;(a) or&nbsp;(b) above unless and to the extent it did not otherwise learn of such action and such failure results in the forfeiture by the
indemnifying party of substantial rights and defenses and (2)&nbsp;will not, in any event, relieve the indemnifying party from any obligations to any indemnified party other than the indemnification obligation provided in paragraph&nbsp;(a)
or&nbsp;(b) above. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(d) If the indemnification provided for in paragraph&nbsp;(a) or&nbsp;(b) of this Section&nbsp;8 is unavailable to an
indemnified party or insufficient in respect of any losses, claims, damages or liabilities referred to therein in connection with any offering of Securities, then the Company and the Underwriters severally agree that each indemnifying party under
such paragraph, in lieu of indemnifying such indemnified party thereunder, shall contribute to the amount paid or payable by such indemnified party as a result of such losses, claims, damages or liabilities (i)&nbsp;in such proportion as is
appropriate to reflect the relative benefits received by the Company on the one hand and the Underwriters on the other from the offering of the Securities or (ii)&nbsp;if the allocation provided by clause&nbsp;(i) above is not permitted by
applicable law, in such proportion as is appropriate to reflect not only the relative benefits referred to in clause (i)&nbsp;above but also the relative fault of the Company on the one hand and of the Underwriters on the other in connection with
the statements or omissions which resulted in such losses, claims, damages or liabilities, as well as any other relevant equitable considerations. The relative benefits received by the Company on the one hand and the Underwriters on the other in
connection with the offering of the Securities shall be deemed to be in the same respective proportions as the net proceeds from the offering of such Securities (before deducting expenses) received by the Company and the total discounts and
commissions received by the Underwriters in respect thereof, in each case as set forth in the Prospectus, bear to the total aggregate public offering price of such Securities; provided, however, that in no case shall any Underwriter (except as may
be provided in any agreement among underwriters relating to the offering of the Securities) be responsible for any amount in excess of the underwriting discount or commission applicable to the Securities purchased by such Underwriter hereunder. The
relative fault of the Company on the one hand </P>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">12 </P>


<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">

 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">
and of the Underwriters on the other shall be determined by reference to, among other things, whether the untrue or allegedly untrue statement of a material fact or omission or alleged omission
to state a material fact relates to information supplied by the Company or by the Underwriters and the parties&#146; relative intent, knowledge, access to information and opportunity to correct or prevent such statement or omission. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(e) The Company and the Underwriters agree that it would not be just and equitable if contribution pursuant to this Section&nbsp;8 were
determined by pro rata allocation (even if the Underwriters were treated as one entity for such purpose) or by any other method of allocation which does not take account of the considerations referred to in the immediately preceding paragraph. The
amount paid or payable by an indemnified party as a result of the losses, claims, damages and liabilities referred to in paragraph&nbsp;(d) above shall be deemed to include, subject to the limitations set forth above, any legal or other expenses
reasonably incurred by such indemnified party in connection with investigating or defending any such action or claim. No person guilty of fraudulent misrepresentation (within the meaning of Section&nbsp;11(f) of the Securities Act) shall be entitled
to contribution from any person who was not guilty of such fraudulent misrepresentation. The remedies provided for in this Section&nbsp;8 are not exclusive and shall not limit any rights or remedies which may otherwise be available to any
indemnified party at law or in equity. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:13%; font-size:10pt; font-family:Times New Roman">The indemnity and contribution agreements contained in this Section&nbsp;8 and the representations
and warranties of the Company in this Agreement shall remain operative and in full force and effect regardless of (i)&nbsp;termination of this Agreement, (ii)&nbsp;any investigation made by any Underwriter or on behalf of any Underwriter or any
person controlling any Underwriter or by or on behalf of the Company, its directors or officers or any person controlling the Company and (iii)&nbsp;acceptance of and payment for any of the Securities. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:17%; font-size:10pt; font-family:Times New Roman">9. If any one or more Underwriters shall fail to purchase and pay for any of the Securities agreed to be purchased by such Underwriter or
Underwriters and such failure to purchase shall constitute a default in the performance of its or their obligations under this Agreement, the remaining Underwriters shall be obligated severally to take up and pay for (in the respective proportions
which the principal amount of Securities set forth opposite their names in the Underwriting Agreement bears to the aggregate principal amount of Securities set forth opposite the names of all the remaining underwriters) the Securities which the
defaulting Underwriter or Underwriters agreed but failed to purchase; provided, however, that in the event that the aggregate principal amount of Securities which the defaulting Underwriter or Underwriters agreed but failed to purchase shall exceed
10% of the aggregate principal amount of Securities set forth in the Underwriting Agreement, the remaining Underwriters shall have the right to purchase all, but shall not be under any obligation to purchase any, of the Securities. If arrangements
satisfactory to the <FONT STYLE="white-space:nowrap">non-defaulting</FONT> Underwriters and the Company for the purchase of at least 90% of the aggregate principal amount of the Securities are not made within 36 hours after such default or if such <FONT
STYLE="white-space:nowrap">non-</FONT> defaulting Underwriters do not agree to purchase at least 90% of the aggregate principal amount of such Securities, this Agreement will terminate without liability to any
<FONT STYLE="white-space:nowrap">non-defaulting</FONT> Underwriter or the Company; provided, however, that if such <FONT STYLE="white-space:nowrap">non-defaulting</FONT> Underwriters agree to purchase at least 90% but less than 100% of the aggregate
principal amount of such Securities, the Company, at its option, may terminate this Agreement and no <FONT STYLE="white-space:nowrap">non-defaulting</FONT> Underwriter or the Company shall have any liability in connection therewith. In the event of
a default by any Underwriter as set forth in this Section&nbsp;9, the Closing Date shall be postponed for such period, not exceeding five business days, as the Representatives shall determine in order that the required changes in the Registration
Statement and the Prospectus or in any other documents or arrangements may be effected. Nothing contained in this Agreement shall relieve any defaulting Underwriter of its liability, if any, to the Company and any
<FONT STYLE="white-space:nowrap">non-defaulting</FONT> Underwriter for damages occasioned by its default hereunder. </P>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">13 </P>


<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">

 <P STYLE="margin-top:0pt; margin-bottom:0pt; text-indent:17%; font-size:10pt; font-family:Times New Roman">10. This Agreement shall become effective upon the execution and delivery hereof by the parties
hereto. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:17%; font-size:10pt; font-family:Times New Roman">11. This Agreement shall be subject to termination in the absolute discretion of the Representatives, by notice given to the
Company, if prior to the Closing Date (i)&nbsp;trading in securities generally on the New York Stock Exchange, the Nasdaq Global Market or the Chicago Stock Exchange shall have been suspended or materially limited, (ii)&nbsp;a general moratorium on
commercial banking activities in New York shall have been declared by either federal or New York State authorities, (iii)&nbsp;there shall have occurred a material disruption in securities settlement, payment or clearance services in the United
States or (iv)&nbsp;there shall have occurred any material outbreak or escalation of hostilities or other calamity or crisis and, in the case of any of the events described in clauses (i)&nbsp;through (iv) above, the effect of such event on the
financial markets of the United States, in the reasonable judgment of the Representatives, is so material and adverse that it is impractical to market the Securities on the terms and in the manner contemplated by the Disclosure Package and the
Prospectus (exclusive of any amendment of supplement thereto). </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:17%; font-size:10pt; font-family:Times New Roman">12. If this Agreement shall be terminated by the Underwriters or any of
them, because of any failure or refusal on the part of the Company to comply with the terms or to fulfill any of the conditions of this Agreement, or if for any reason the Company shall be unable to perform its obligations under this Agreement
except pursuant to Section&nbsp;9 hereof, the Company will reimburse the Underwriters or such Underwriters as have so terminated this Agreement with respect to themselves, severally through the Representatives on demand, for all <FONT
STYLE="white-space:nowrap"><FONT STYLE="white-space:nowrap">out-of-pocket</FONT></FONT> expenses (including the reasonable fees and disbursements of their counsel) reasonably incurred by such Underwriters in connection with this Agreement. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:17%; font-size:10pt; font-family:Times New Roman">13. This Agreement may be signed in any number of counterparts, each of which shall be an original, with the same effect as if the signatures
thereto and hereto were upon the same instrument. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:17%; font-size:10pt; font-family:Times New Roman">14. This Agreement shall be governed by and construed in accordance with the laws of
the State of New York applicable to a contract executed and performed in such State without giving effect to the conflicts of laws principles thereof. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:17%; font-size:10pt; font-family:Times New Roman">15. The Company hereby acknowledges that (a)&nbsp;the purchase and sale of the Securities pursuant to this Agreement is an <FONT
STYLE="white-space:nowrap">arm&#146;s-length</FONT> commercial transaction between the Company, on the one hand, and the Underwriters and any affiliate through which it may be acting, on the other, (b)&nbsp;the Underwriters are acting as principal
and not as an agent or fiduciary of the Company and (c)&nbsp;the Company&#146;s engagement of the Underwriters in connection with the offering and the process leading up to the offering is as independent contractors and not in any other capacity.
Furthermore, the Company agrees that it is solely responsible for making its own judgments in connection with the offering (irrespective of whether any of the Underwriters has advised or is currently advising the Company on related or other
matters). The Company agrees that it will not claim that the Underwriters have rendered advisory services of any nature or respect, or owe an agency, fiduciary or similar duty to the Company, in connection with such transaction or the process
leading thereto.<B> </B> </P>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">14 </P>


<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">

 <P STYLE="margin-top:0pt; margin-bottom:0pt; text-indent:13%; font-size:10pt; font-family:Times New Roman">If the foregoing is in accordance with your understanding of our agreement, please sign and
return to us the enclosed duplicate hereof, whereupon this letter and your acceptance shall represent a binding agreement between the Company and the several Underwriters. </P>
<P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P><DIV ALIGN="right">
<TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="40%" BORDER="0" STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt">


<TR>
<TD WIDTH="6%"></TD>
<TD VALIGN="bottom" WIDTH="2%"></TD>
<TD WIDTH="92%"></TD></TR>


<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" COLSPAN="3">Very truly yours,</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="16" COLSPAN="3"></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" COLSPAN="3"><B>GATX CORPORATION</B></TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="16"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">By:</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:1pt; border-bottom:1px solid #000000; font-size:10pt; font-family:Times New Roman">/s/ Eric D. Harkness</P></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top">Name: Eric D. Harkness</TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top">Title: VP, Treasurer and Chief Risk Officer</TD></TR>
</TABLE></DIV> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><I>Signature Page to Underwriting Agreement </I></P>

<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">

 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">The foregoing Agreement is hereby </P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">confirmed and accepted as of the </P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">date first above written. </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; margin-left:2%; text-indent:-2%; font-size:10pt; font-family:Times New Roman"><B>CITIGROUP GLOBAL MARKETS INC. </B></P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="40%" BORDER="0" STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt">


<TR>
<TD WIDTH="13%"></TD>
<TD VALIGN="bottom" WIDTH="1%"></TD>
<TD WIDTH="86%"></TD></TR>


<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">By:</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:1pt; border-bottom:1px solid #000000; font-size:10pt; font-family:Times New Roman">/s/ Adam D. Bordner</P></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">Name:</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top">Adam D. Bordner</TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">Title:</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top">Director</TD></TR>
</TABLE> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"><B>MERRILL LYNCH, PIERCE, FENNER&nbsp;&amp; SMITH </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"><B>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;INCORPORATED </B></P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="40%" BORDER="0" STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt">


<TR>
<TD WIDTH="7%"></TD>
<TD VALIGN="bottom" WIDTH="1%"></TD>
<TD WIDTH="92%"></TD></TR>


<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">By:</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:1pt; border-bottom:1px solid #000000; font-size:10pt; font-family:Times New Roman">/s/ Andrew Stinson</P></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top">Name: Andrew Stinson</TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top">Title: Managing Director</TD></TR>
</TABLE> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">For themselves and the other several </P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Underwriters named in<U> </U></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"><U>Schedule</U><U></U><U>&nbsp;I</U> to the foregoing Agreement. </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><I>Signature Page to Underwriting Agreement </I></P>

<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">

 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">SCHEDULE I </P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="100%" BORDER="0" STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" ALIGN="center">


<TR>
<TD WIDTH="82%"></TD>
<TD VALIGN="bottom" WIDTH="9%"></TD>
<TD></TD>
<TD></TD>
<TD></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:8pt">
<TD VALIGN="bottom" NOWRAP> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; border-bottom:1.00pt solid #000000; width:39.05pt; display:inline; font-size:8pt; font-family:Times New Roman; ">Underwriter</P></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="bottom" COLSPAN="2" ALIGN="center" STYLE="border-bottom:1.00pt solid #000000">Principal&nbsp;Amount&nbsp;of&nbsp;4.550%<br>Senior Notes due 2028</TD>
<TD VALIGN="bottom">&nbsp;</TD></TR>


<TR BGCOLOR="#cceeff" STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; margin-left:1.00em; text-indent:-1.00em; font-size:10pt; font-family:Times New Roman">Citigroup Global Markets Inc.</P></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="bottom">$</TD>
<TD VALIGN="bottom" ALIGN="right">90,000,000</TD>
<TD NOWRAP VALIGN="bottom">&nbsp;</TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; margin-left:1.00em; text-indent:-1.00em; font-size:10pt; font-family:Times New Roman">Merrill Lynch, Pierce, Fenner&nbsp;&amp; Smith Incorporated</P></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="bottom">$</TD>
<TD VALIGN="bottom" ALIGN="right">90,000,000</TD>
<TD NOWRAP VALIGN="bottom">&nbsp;</TD></TR>
<TR BGCOLOR="#cceeff" STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; margin-left:1.00em; text-indent:-1.00em; font-size:10pt; font-family:Times New Roman">Morgan Stanley&nbsp;&amp; Co. LLC</P></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="bottom">$</TD>
<TD VALIGN="bottom" ALIGN="right">37,500,000</TD>
<TD NOWRAP VALIGN="bottom">&nbsp;</TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; margin-left:1.00em; text-indent:-1.00em; font-size:10pt; font-family:Times New Roman">Mizuho Securities USA LLC</P></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="bottom">$</TD>
<TD VALIGN="bottom" ALIGN="right">15,000,000</TD>
<TD NOWRAP VALIGN="bottom">&nbsp;</TD></TR>
<TR BGCOLOR="#cceeff" STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; margin-left:1.00em; text-indent:-1.00em; font-size:10pt; font-family:Times New Roman">U.S. Bancorp Investments, Inc.</P></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="bottom">$</TD>
<TD VALIGN="bottom" ALIGN="right">15,000,000</TD>
<TD NOWRAP VALIGN="bottom">&nbsp;</TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; margin-left:1.00em; text-indent:-1.00em; font-size:10pt; font-family:Times New Roman">BMO Capital Markets Corp.</P></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="bottom">$</TD>
<TD VALIGN="bottom" ALIGN="right">7,500,000</TD>
<TD NOWRAP VALIGN="bottom">&nbsp;</TD></TR>
<TR BGCOLOR="#cceeff" STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; margin-left:1.00em; text-indent:-1.00em; font-size:10pt; font-family:Times New Roman">BNY Mellon Capital Markets, LLC</P></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="bottom">$</TD>
<TD VALIGN="bottom" ALIGN="right">7,500,000</TD>
<TD NOWRAP VALIGN="bottom">&nbsp;</TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; margin-left:1.00em; text-indent:-1.00em; font-size:10pt; font-family:Times New Roman">KeyBanc Capital Markets Inc.</P></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="bottom">$</TD>
<TD VALIGN="bottom" ALIGN="right">7,500,000</TD>
<TD NOWRAP VALIGN="bottom">&nbsp;</TD></TR>
<TR BGCOLOR="#cceeff" STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; margin-left:1.00em; text-indent:-1.00em; font-size:10pt; font-family:Times New Roman">Loop Capital Markets LLC</P></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="bottom">$</TD>
<TD VALIGN="bottom" ALIGN="right">7,500,000</TD>
<TD NOWRAP VALIGN="bottom">&nbsp;</TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; margin-left:1.00em; text-indent:-1.00em; font-size:10pt; font-family:Times New Roman">Mitsubishi UFJ Securities</P></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="bottom">$</TD>
<TD VALIGN="bottom" ALIGN="right">7,500,000</TD>
<TD NOWRAP VALIGN="bottom">&nbsp;</TD></TR>
<TR BGCOLOR="#cceeff" STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; margin-left:1.00em; text-indent:-1.00em; font-size:10pt; font-family:Times New Roman">PNC Capital Markets LLC</P></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="bottom">$</TD>
<TD VALIGN="bottom" ALIGN="right">7,500,000</TD>
<TD NOWRAP VALIGN="bottom">&nbsp;</TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; margin-left:1.00em; text-indent:-1.00em; font-size:10pt; font-family:Times New Roman">The Williams Capital Group, L.P.</P></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="bottom">$</TD>
<TD VALIGN="bottom" ALIGN="right">7,500,000</TD>
<TD NOWRAP VALIGN="bottom">&nbsp;</TD></TR>
<TR BGCOLOR="#cceeff" STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; margin-left:3.00em; text-indent:-1.00em; font-size:10pt; font-family:Times New Roman"><B>Total</B></P></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="bottom"><B>$</B></TD>
<TD VALIGN="bottom" ALIGN="right"><B>300,000,000</B></TD>
<TD NOWRAP VALIGN="bottom"><B>&nbsp;</B></TD></TR>
</TABLE>

<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">

 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">Schedule&nbsp;II </P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">Issuer Free Writing Prospectuses </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">None. </P>

<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">

 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">Schedule&nbsp;III </P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">Form of Final Term Sheet </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>GATX
Corporation </B></P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>PRICING TERM SHEET </B></P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>May&nbsp;3, 2018 </B></P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="100%" BORDER="0" STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" ALIGN="center">


<TR>
<TD WIDTH="37%"></TD>
<TD VALIGN="bottom" WIDTH="2%"></TD>
<TD WIDTH="61%"></TD></TR>


<TR STYLE="font-size:1pt">
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"><B>Issuer:</B></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">GATX Corporation</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"><B>Security:</B></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">4.550% Senior Notes due 2028</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"><B>Size:</B></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">$300,000,000</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"><B>Maturity Date:</B></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">November&nbsp;7, 2028</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"><B>Coupon:</B></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">4.550%</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"><B>Interest Payment Dates:</B></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">May&nbsp;7 and November&nbsp;7, commencing November&nbsp;7, 2018</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"><B>Benchmark Treasury:</B></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">UST 2.750% due February&nbsp;15, 2028</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"><B>Benchmark Treasury Price and Yield:</B></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top"><FONT STYLE="white-space:nowrap">98-10;</FONT> 2.950%</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"><B>Spread to Benchmark Treasury:</B></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">+160 basis points</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"><B>Yield to Maturity:</B></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">4.550%</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"><B>Price to Investors:</B></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">100.000%</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"><B>Redemption:</B></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">At any time prior to August&nbsp;7, 2028, at a make-whole price equal to the greater of (a) 100% of the principal amount or (b)&nbsp;discounted present value at Treasury rate plus 25 basis points; and on or after August&nbsp;7,
2028, at 100% of the principal; plus, in each case, accrued interest to but excluding the redemption date</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"><B>Pricing Date:</B></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">May&nbsp;3, 2018</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"><B>Expected Settlement Date:</B></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">May&nbsp;7, 2018 (T+2)</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"><B>CUSIP/ISIN:</B></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">361448 BC6/US361448BC68</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"><B>Joint Book-Running Managers:</B></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Citigroup Global Markets Inc.</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Merrill Lynch,
Pierce, Fenner&nbsp;&amp; Smith</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Incorporated</P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:10pt; font-family:Times New Roman">Morgan Stanley&nbsp;&amp; Co. LLC</P></TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"><B>Senior <FONT STYLE="white-space:nowrap">Co-Managers:</FONT></B></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Mizuho Securities USA LLC</P> <P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:10pt; font-family:Times New Roman">U.S. Bancorp
Investments, Inc.</P></TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"><B><FONT STYLE="white-space:nowrap">Co-Managers:</FONT></B></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">BMO Capital Markets Corp.</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">BNY Mellon Capital
Markets, LLC</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">KeyBanc Capital Markets Inc.</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Loop Capital
Markets LLC</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">MUFG Securities Americas Inc.</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">PNC Capital Markets
LLC</P> <P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:10pt; font-family:Times New Roman">The Williams Capital Group, L.P.</P></TD></TR>
</TABLE>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">III-1 </P>


<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">

 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"><B>The issuer has filed a registration statement (including a prospectus) with the SEC for the offering to which
this communication relates. Before you invest, you should read the prospectus in that registration statement and other documents the issuer has filed with the SEC for more complete information about the issuer and this offering. </B></P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"><B>You may get these documents for free by visiting EDGAR on the SEC Web site at www.sec.gov. Alternatively, the issuer, any underwriter or any dealer
participating in the offering will arrange to send you the prospectus if you request it by calling Citigroup Global Markets Inc. toll-free at <FONT STYLE="white-space:nowrap"><FONT STYLE="white-space:nowrap">1-800-831-9146</FONT></FONT> or Merrill
Lynch, Pierce, Fenner&nbsp;&amp; Smith Incorporated at <FONT STYLE="white-space:nowrap"><FONT STYLE="white-space:nowrap"><FONT STYLE="white-space:nowrap">1-800-294-1322.</FONT></FONT></FONT> </B></P>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">III-2 </P>


<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">

 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">Schedule&nbsp;IV </P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">Permitted Free Writing Prospectuses </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">None. </P>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">IV-1 </P>


<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">

 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">Exhibit A </P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">Opinion of Peter J. Falconer, Associate </P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">General Counsel of GATX Corporation </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Citigroup
Global Markets Inc. </P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">388 Greenwich Street </P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">New York, New York
10013 </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Merrill Lynch, Pierce, Fenner&nbsp;&amp; Smith </P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; margin-left:10%; font-size:10pt; font-family:Times New Roman">Incorporated </P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">One Bryant Park </P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">New York, New York 10036 </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:2%; font-size:10pt; font-family:Times New Roman">As Representatives of
the Underwriters </P> <P STYLE="margin-top:0pt; margin-bottom:0pt; margin-left:2%; font-size:10pt; font-family:Times New Roman">Listed in Schedule I to the Underwriting </P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; margin-left:2%; font-size:10pt; font-family:Times New Roman">Agreement referred to below </P> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR style = "page-break-inside:avoid">
<TD WIDTH="8%">&nbsp;</TD>
<TD WIDTH="5%" VALIGN="top" ALIGN="left">Re:</TD>
<TD ALIGN="left" VALIGN="top">GATX Corporation </TD></TR></TABLE>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR style = "page-break-inside:avoid">
<TD WIDTH="8%">&nbsp;</TD>
<TD WIDTH="5%" VALIGN="top" ALIGN="left">&nbsp;</TD>
<TD ALIGN="left" VALIGN="top">4.550% Senior Notes due 2028 </TD></TR></TABLE> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Ladies and Gentlemen: </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">This opinion is being furnished pursuant to Section&nbsp;5(b) of the Underwriting Agreement dated as of May 3, 2018 among GATX Corporation (the
&#147;Company&#148;) and you, as Underwriters (the &#147;Underwriting Agreement&#148;), pursuant to which you are on this date purchasing, as shown in the Underwriting Agreement, $300,000,000 aggregate principal amount of 4.550% Senior Notes due
2028 of the Company. You and your counsel may rely on this opinion as contemplated by the Underwriting Agreement. Except as otherwise noted herein, all capitalized terms used herein shall have the meaning set forth, or incorporated by reference, in
the Underwriting Agreement. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">I am Associate General Counsel and Assistant Secretary of the Company and I or other attorneys working under
my supervision have acted as counsel to the Company, together with Mayer Brown LLP whose opinion is being provided to you, in the preparation, execution and delivery of the Underwriting Agreement among you and the Company. In connection with the
opinion herein, I or other legal staff working under my supervision have examined such documents, records, certificates, instruments and opinions as I have deemed relevant and necessary as a basis for my opinion expressed below. In such examination,
I have assumed the genuineness of all signatures and the authenticity of all documents submitted to me as originals and the conformity with the originals of all documents submitted to me as copies. In addition, I have relied as to matters of fact
upon the representations and warranties contained in the Underwriting Agreement and upon certificates of officers of the Company and certificates of public officials. I or other legal staff working under my supervision have also participated in the
preparation of, and are familiar with, the Registration Statement, the Disclosure Package and the Prospectus. </P>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">A-1 </P>


<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">

 <P STYLE="margin-top:0pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Based on the above, I am<B><I> </I></B>of the opinion that: </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">1. Each Significant Subsidiary has been duly incorporated and is validly existing as a corporation in good standing under the laws of the
jurisdiction of its incorporation. Each Significant Subsidiary has the corporate power and authority to own its property and to conduct its business as described in the Disclosure Package and the Prospectus. Each Significant Subsidiary is duly
qualified to transact business and is in good standing in each jurisdiction in which the conduct of its business or the ownership or leasing of its property requires such qualification, except to the extent that the failure to be so qualified or be
in good standing would not, individually or in the aggregate, reasonably be expected to have a Material Adverse Effect. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">2. The execution
and delivery by the Company of, and the performance by the Company of its obligations under, the Underwriting Agreement and the Indenture and the issuance and sale of the Securities by the Company will not (A)&nbsp;constitute a default under any
indenture, mortgage, deed of trust, loan agreement or other agreement or instrument to which the Company or any of its subsidiaries is a party or by which the Company or any of its subsidiaries is bound or to which any of the property or assets of
the Company or any of its subsidiaries is subject (each, an &#147;Existing Instrument&#148;), (B) conflict with or constitute a breach of, or default under, or result in the creation or imposition of any lien, charge or encumbrance upon any of the
property or assets of the Company or any of its subsidiaries pursuant to any Existing Instrument or (C)&nbsp;result in any violation of any Federal or Illinois law or any regulation, judgment, order or decree of any governmental body, agency or
court having jurisdiction over the Company or any of its subsidiaries except, in each case, for such defaults, conflicts, breaches, liens, charges, encumbrances or violations as would not, individually or in the aggregate, reasonably be expected to
have a Material Adverse Effect; and, to the best of my knowledge, no consent, approval or authorization of any governmental body or agency is required for the performance by the Company of its obligations under the Underwriting Agreement or the
Securities, except such as have been or will be obtained prior to the Closing Date under the Securities Act, the Exchange Act and the Trust Indenture Act and such as may be required under the securities or Blue Sky laws of the various states in
connection with the offer and sale of the Securities. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">3. There are no legal or governmental proceedings pending or, to the best of my
knowledge, threatened to which the Company or any of its subsidiaries is a party or to which any of the properties of the Company or any of its subsidiaries is subject that are required to be described in the Registration Statement or the Disclosure
Package or the Prospectus and are not so described or, to the best of my knowledge, any statutes, regulations, contracts or other documents that are required to be described in the Registration Statement, the Disclosure Package or the Prospectus or
to be filed as an exhibit to the Registration Statement that are not described or filed as required. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">4. The statements in the Basic
Prospectus under the caption &#147;Description of Debt Securities,&#148; the statements in the Prospectus Supplement under the caption &#147;Description of Notes&#148; and the statements in the Registration Statement and Prospectus incorporated by
reference from Item 3 of the Company&#146;s most recent annual report on Form <FONT STYLE="white-space:nowrap">10-K,</FONT> insofar as such statements constitute summaries of the legal matters, documents or proceedings referred to therein, fairly
present the information called for with respect to such legal matters, documents and proceedings, and fairly summarize the matters referred to therein. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">5. I (1)&nbsp;am of the opinion that each document, if any, filed pursuant to the Exchange Act (except as to financial statements and
schedules, as to which I express no opinion) and incorporated by reference in the Disclosure Package or the Prospectus is appropriately responsive in all material respects with the Exchange Act and the rules and regulations thereunder,
(2)&nbsp;believe that (except as to financial statements and schedules and the Statement of Eligibility and Qualification of the Trustee on <FONT STYLE="white-space:nowrap">Form&nbsp;T-1,</FONT> as to which I express no belief) each part of the
Registration Statement (including the documents incorporated by reference therein), filed with the Commission pursuant to the Securities Act relating to the Securities, when such part became effective did not contain any untrue statement of a
material fact or omit to state a material fact required to be stated therein or necessary to make the statements therein not </P>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">A-2 </P>


<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">

 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">
misleading, and (3)&nbsp;am of the opinion that the Registration Statement and the Prospectus, as amended or supplemented, if applicable (except as to financial statements and schedules and the
Statement of Eligibility and Qualification of the Trustee on <FONT STYLE="white-space:nowrap">Form&nbsp;T-1,</FONT> as to which I express no belief) is appropriately responsive in all material respects with the Securities Act and the applicable
rules and regulations thereunder. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">6. The Registration Statement is effective under the Securities Act, and to my knowledge, no stop order
suspending the effectiveness of the Registration Statement has been issued or proceedings therefor initiated by the Commission. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">As
indicated above, I or other legal staff working under my supervision have examined various documents and participated in conferences with your representatives, your counsel and representatives of the Company at which times the contents of the
Registration Statement, the Prospectus and the Disclosure Package and related matters were discussed. However, except as specifically noted above, I am not passing upon and assume no responsibility for the accuracy, completeness or fairness of the
statements contained in the Registration Statement or the Prospectus or the Disclosure Package or making any representation that I have independently verified or checked the accuracy, completeness or fairness of such statements. Subject to the
foregoing, I advise you that no facts came to my attention which caused me to believe that the Registration Statement, at the Execution Time (other than the financial statements and related schedule and other financial and statistical information
contained therein and the Statement of Eligibility and Qualification of the Trustee on Form <FONT STYLE="white-space:nowrap">T-1</FONT> as to which I express no belief), contained any untrue statement of a material fact or omitted to state any
material fact necessary to make the statements therein not misleading, or that the Disclosure Package at the Execution Time, the Prospectus as of its date, and the Prospectus, as amended and supplemented, if applicable, on the Closing Date (other
than the financial statements and related schedule and other financial and statistical information contained therein as to which I express no belief), contained or contains any untrue statement of a material fact or omitted or omits to state any
material fact necessary to make the statements therein, in light of the circumstances under which they were made, not misleading. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">My
opinions herein are limited to the federal laws of the United States and the laws of the State of Illinois. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">I assume no obligation to
update or supplement this opinion letter to reflect any facts or circumstances that may hereafter come to our attention or any changes in applicable law which may hereafter occur. </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">This letter is addressed to you for your sole benefit and may not be relied upon by any other person without my consent. </P>
<P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P><DIV ALIGN="right">
<TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="40%" BORDER="0" STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt">


<TR>
<TD WIDTH="100%"></TD></TR>


<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">Very truly yours,</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="16"></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">Peter J. Falconer</TD></TR>
</TABLE></DIV>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">A-3 </P>


<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">

 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">Exhibit B </P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">Opinion of Mayer Brown LLP </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Citigroup Global
Markets Inc. </P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">388 Greenwich Street </P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">New York, New York 10013
</P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Merrill Lynch, Pierce, Fenner&nbsp;&amp; Smith </P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; margin-left:8%; font-size:10pt; font-family:Times New Roman">Incorporated </P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">One Bryant Park </P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">New York, New York 10036 </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">As Representatives of the Underwriters
</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Listed in Schedule I to the Underwriting </P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Agreement referred
to below </P> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR style = "page-break-inside:avoid">
<TD WIDTH="13%">&nbsp;</TD>
<TD WIDTH="4%" VALIGN="top" ALIGN="left">Re:</TD>
<TD ALIGN="left" VALIGN="top">GATX Corporation </TD></TR></TABLE>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR style = "page-break-inside:avoid">
<TD WIDTH="13%">&nbsp;</TD>
<TD WIDTH="4%" VALIGN="top" ALIGN="left">&nbsp;</TD>
<TD ALIGN="left" VALIGN="top">4.550% Senior Notes due 2028 </TD></TR></TABLE> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Ladies and Gentlemen: </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:8%; font-size:10pt; font-family:Times New Roman">We have acted as counsel to GATX Corporation, a New York corporation (the &#147;Company&#148;), in connection with the issuance of $300,000,000
aggregate principal amount of 4.550% Senior Notes due 2028 (the &#147;Securities&#148;) of the Company to be sold to you today, and in connection with the preparation, execution and delivery of the Underwriting Agreement dated May&nbsp;3, 2018 (the
&#147;Underwriting Agreement&#148;), among the Company and you, as Underwriters, with respect to the Securities. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:8%; font-size:10pt; font-family:Times New Roman">This opinion is being
delivered to you pursuant to Section&nbsp;5(c) of the Underwriting Agreement. Capitalized terms not otherwise defined herein shall have the meaning ascribed to them in, or incorporated by reference in, the Underwriting
Agreement.&nbsp;&nbsp;&nbsp;&nbsp; </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:8%; font-size:10pt; font-family:Times New Roman">In rendering the opinions expressed herein, we have examined a signed copy of the Underwriting
Agreement, the Registration Statement, the Indenture, the preliminary prospectus, the Disclosure Package, the Prospectus and the global certificates representing the Securities (each as defined in the Underwriting Agreement). We have also examined
such other documents and instruments and have made such further investigations as we have deemed necessary or appropriate in connection with this opinion. </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:8%; font-size:10pt; font-family:Times New Roman">In expressing the opinions set forth below, we have assumed the genuineness of all signatures, the authenticity of all documents submitted to
us as originals, the conformity to the original documents of all documents submitted to us as certified, conformed or photostatic copies and the legal competence of each individual executing any document. As to all parties, we have assumed the due
authorization, execution and delivery of all documents and the validity and enforceability thereof against all parties thereto, other than the Company, in accordance with their respective terms. With respect to matters stated to be based on our
knowledge, our opinion is based on such information as has come to the actual attention of the attorneys in our firm who have performed substantive legal services for the Company. </P>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">B-1 </P>


<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">

 <P STYLE="margin-top:0pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">As to matters of fact (but not as to legal conclusions), to the extent we deemed proper, we have
relied on certificates of responsible officers of the Company and of public officials and on the representations, warranties and agreements of the Company contained in the Underwriting Agreement. </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Based upon and subject to the foregoing, and having regard for legal considerations which we deem relevant, we are of the opinion that: </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(i) The Company has been duly incorporated and is validly existing as a corporation in good standing under the laws of the State of New York.
The Company has the corporate power and authority to own its property and to conduct its business as described in the Disclosure Package and Prospectus. The Company is duly qualified to transact business and is in good standing in each jurisdiction
in which the conduct of its business or the ownership and leasing of its properties requires such qualification, except to the extent that the failure to be so qualified or be in good standing would not, individually or in the aggregate, reasonably
be expected to have a Material Adverse Effect. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(ii) The Underwriting Agreement has been duly authorized, executed and delivered by the
Company. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(iii) The Registration Statement has become effective under the Securities Act of 1933, as amended (the &#147;Securities
Act&#148;). </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(iv) To our knowledge, no consent, approval or authorization of any governmental body or agency is required for the
performance by the Company of its obligations under the Indenture, except such as have been or will be obtained prior to the Closing Date under the Securities Act, the Exchange Act and the Trust Indenture Act and such as may be required under the
securities or Blue Sky laws of the various states in connection with the offer and sale of the Securities. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(v) To our knowledge, no stop
order suspending the effectiveness of the Registration Statement or any part thereof has been issued and no proceedings for that purpose have been instituted or are pending or contemplated under the Securities Act. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(vi) The Registration Statement, as of the latest effective date, appears on its face to comply as to form in all material respects with the
requirements of the Securities Act, the rules and regulations issued by the Commission thereunder and the Trust Indenture Act of 1939, as amended (the &#147;Trust Indenture Act&#148;). </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(vii) The Company is not and, after giving effect to the offering and sale of the Securities and the application of the proceeds thereof as
described in the Disclosure Package, will not be an &#147;investment company&#148; as defined in the Investment Company Act of 1940, as amended. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(viii) The Prospectus, as of its date and the date hereof, appears on its face to comply as to form in all material respects with the
requirements of the Securities Act, the rules and regulations issued by the Commission thereunder and the Trust Indenture Act. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(ix) The
Disclosure Package, as of the Execution Time, appears on its face to comply as to form in all material respects with the requirements of the Securities Act, the rules and regulations issued by the Commission thereunder and the Trust Indenture Act.
</P> <P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(x) The Indenture has been duly authorized, executed and delivered by the Company and constitutes a valid and binding agreement of the
Company enforceable in accordance with its terms, except as enforceability thereof may be limited by the Enforceability Exceptions. The Indenture has been duly qualified under the Trust Indenture Act and conforms in all material respects to the
descriptions thereof contained in the Disclosure Package and the Prospectus. </P>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">B-2 </P>


<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">

 <P STYLE="margin-top:0pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(xi) The Securities have been duly authorized, executed and delivered by the Company and
constitute valid and binding obligations of the Company enforceable in accordance with their terms, except as enforceability thereof may be limited by the Enforceability Exceptions. The Securities are entitled to the benefit of the Indenture and
conform in all material respects to the descriptions thereof contained in the Disclosure Package and the Prospectus. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(xii) The execution
and delivery by the Company of, and the performance by the Company of its obligations under, the Underwriting Agreement and the Indenture and the issuance and sale of the Securities by the Company will not (A)&nbsp;result in any violation of the
certificate of incorporation or bylaws of the Company or (B)&nbsp;result in any violation of any applicable law or, to our knowledge, any judgment, order or decree of any Illinois or New York governmental body, agency or court having jurisdiction
over the Company, and no consent, approval, authorization or order of, or qualification with, any Illinois or New York governmental body or agency is required for the performance by the Company of its obligations under the Underwriting Agreement,
the Indenture or the issuance and sale of the Securities by the Company, other than as have been obtained, except such as may be required by the securities or Blue Sky laws of the various states in connection with the offer and sale of the
Securities as to which we express no opinion except, in the case of clause (B), for violations as would not, individually or in the aggregate, reasonably be expected to have a Material Adverse Effect. </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">We have examined various documents and participated in conferences with representatives of the Company, its counsel and accountants and with
representatives of the Underwriters at which times the contents of the Registration Statement and the Prospectus and Disclosure Package were discussed. Other than as set forth in opinions (x)&nbsp;and (xi) above, we are not passing upon and assume
no responsibility for the accuracy, completeness or fairness of the statements contained in the Registration Statement, the Prospectus or the Disclosure Package or making any representation that we have independently verified or checked the
accuracy, completeness or fairness of such statements. Also, we are expressing no view as to the financial statements and related schedules or the other financial data included or incorporated by reference in the Registration Statement, the
Disclosure Package or the Prospectus or omitted therefrom. Subject to the foregoing, we advise you that nothing came to our attention that caused us to believe that (i)&nbsp;the Registration Statement, as of each new effective date with respect to
the Securities pursuant to, and within the meaning of, Rule 430(B)(f)(2) under the Securities Act, contained an untrue statement of a material fact or omitted to state a material fact required to be stated therein or necessary to make the statements
therein not misleading; (ii)&nbsp;the Prospectus, as of its date or at the date hereof, contained or contains an untrue statement of a material fact or omitted or omits to state a material fact necessary in order to make the statements therein, in
the light of the circumstances under which they were made, not misleading, or (iii)&nbsp;the Disclosure Package, as of the Execution Time, contained any untrue statement of a material fact or omitted to state any material fact necessary in order to
make the statements therein, in the light of the circumstances under which they were made, not misleading. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">We are admitted to practice
law in the States of Illinois and New York and our opinions expressed herein are limited solely to the federal laws of the United States of America and the laws of the States of Illinois and New York, and we express no opinion herein concerning the
laws of any other jurisdiction. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">The opinions and statements expressed herein are as of the date hereof. We assume no obligation to update
or supplement this opinion letter to reflect any facts or circumstances that may hereafter come to our attention or any changes in applicable law which may hereafter occur. </P>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">B-3 </P>


<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">

 <P STYLE="margin-top:0pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">This opinion is furnished by us pursuant to Section&nbsp;5(c) of the Underwriting Agreement and
is solely for the benefit of the Underwriters and no other person (including, without limitation, any person who acquires Securities from any of the Underwriters) is entitled to rely hereon and no other use or distribution hereof shall be made
without our prior written approval in each such case. </P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P><DIV ALIGN="right">
<TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="40%" BORDER="0" STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt">


<TR>
<TD WIDTH="100%"></TD></TR>


<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">Very truly yours,</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="16"></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">M<SMALL>AYER</SMALL> B<SMALL>ROWN</SMALL> LLP</TD></TR>
</TABLE></DIV>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">B-4 </P>

</BODY></HTML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-5.1
<SEQUENCE>3
<FILENAME>d550501dex51.htm
<DESCRIPTION>EX-5.1
<TEXT>
<HTML><HEAD>
<TITLE>EX-5.1</TITLE>
</HEAD>
 <BODY BGCOLOR="WHITE">

 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="right"><B>Exhibit 5.1 </B></P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="right">Mayer Brown LLP </P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="right">71 South Wacker
Drive </P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="right">Chicago, Illinois 60606-4637 </P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="100%" BORDER="0" STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" ALIGN="center">


<TR>
<TD WIDTH="51%"></TD>
<TD VALIGN="bottom" WIDTH="2%"></TD>
<TD WIDTH="47%"></TD></TR>


<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="bottom">May&nbsp;4, 2018</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="right">Main Tel (312) <FONT STYLE="white-space:nowrap">782-0600</FONT></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="right">Main Fax (312) <FONT STYLE="white-space:nowrap">701-7711</FONT></P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:10pt; font-family:Times New Roman" ALIGN="right">www.mayerbrown.com</P></TD></TR>
</TABLE> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">GATX Corporation </P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">222 West Adams
Street </P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Chicago, Illinois 60606 </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Ladies and Gentlemen: </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">We have acted as counsel to GATX Corporation, a New York corporation (&#147;GATX&#148;), in connection with an offering pursuant to Rule 415
under the Securities Act of 1933, as amended (the &#147;Securities Act&#148;), of GATX&#146;s issuance of $300,000,000 aggregate principal amount of 4.550% Senior Notes due 2028 (the &#147;Notes&#148;). The Notes are to be issued under the
Indenture, dated as of February&nbsp;6, 2008, between GATX and U.S. Bank National Association, as Trustee (the &#147;Indenture&#148;). The Notes are subject to the Underwriting Agreement (the &#147;Underwriting Agreement&#148;), dated May&nbsp;3,
2018, between GATX and Citigroup Global Markets Inc. and Merrill Lynch, Pierce, Fenner&nbsp;&amp; Smith Incorporated, as representatives of the several underwriters listed therein. </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">We have also participated in the preparation and filing with the Securities and Exchange Commission under the Securities Act of a Registration
Statement on Form <FONT STYLE="white-space:nowrap">S-3,</FONT> as amended (File <FONT STYLE="white-space:nowrap">No.&nbsp;333-213160)</FONT> (the &#147;Registration Statement&#148;), relating to the Notes. In rendering our opinions set forth below,
we have examined originals or copies identified to our satisfaction of (i)&nbsp;the Underwriting Agreement; (ii)&nbsp;the Registration Statement; (iii)&nbsp;the prospectus as supplemented relating to the Notes; (iv)&nbsp;the Indenture; (v)&nbsp;the
forms of the Notes; and (vi)&nbsp;officers&#146; certificates establishing the terms of the Notes pursuant to the Indenture. The Notes are registered on the Registration Statement. In addition, we have examined and relied upon other documents,
certificates, corporate records, opinions and instruments, obtained from GATX or other sources believed by us to be reliable, as we have deemed necessary or appropriate for the purpose of this opinion. </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">In expressing the opinions set forth below, we have assumed the genuineness of all signatures, the authenticity of all documents submitted to
us as originals, the conformity to the original documents of all documents submitted to us as certified, conformed or photostatic copies and the legal competence of each individual executing any document. As to all parties, we have assumed the due
authorization, execution and delivery of all documents and the validity and enforceability thereof against all parties thereto, other than GATX, in accordance with their respective terms. </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">As to matters of fact (but not as to legal conclusions), to the extent we deemed proper, we have relied on certificates of responsible
officers of GATX and of public officials and on the representations, warranties and agreements of GATX contained in the applicable Underwriting Agreements. </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">Mayer Brown LLP operates in combination with other Mayer Brown entities, which have offices in North America, </P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">Europe and Asia and are associated with Tauil&nbsp;&amp; Chequer Advogados, a Brazilian law partnership. </P>

<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">

 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Mayer Brown LLP </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">GATX Corporation </P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">May&nbsp;4, 2018 </P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Page 2 </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Based upon and subject to the foregoing
and to the assumptions, conditions and limitations set forth herein, and assuming that the Notes are issued in accordance with the terms of the Underwriting Agreement, we are of the opinion that the Notes constitute valid and legally binding
obligations of GATX entitled to the benefits of the Indenture, except that (a)&nbsp;the enforceability thereof may be subject to (i)&nbsp;bankruptcy, insolvency, reorganization, moratorium, fraudulent conveyance or other similar laws now or
hereafter in effect relating to or affecting creditors&#146; rights or remedies generally and (ii)&nbsp;general principles of equity and to the discretion of the court before which any proceedings therefor may be brought (regardless of whether
enforcement is sought in a proceeding at law or in equity) and (b)&nbsp;the enforceability of provisions imposing liquidated damages, penalties or an increase in interest rate upon the occurrence of certain events may be limited in certain
circumstances. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">We hereby consent to the filing of this opinion as an exhibit to the Registration Statement and to being named in the
related prospectus and any related prospectus supplement under the caption &#147;Legal Opinions&#148; with respect to the matters stated therein. </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">We are admitted to practice law in the State of New York and our opinions expressed herein are limited solely to the federal laws of the
United States of America, the laws of the State of New York, and we express no opinion herein concerning the laws of any other jurisdiction. </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; margin-left:54%; text-indent:-2%; font-size:10pt; font-family:Times New Roman">Very truly yours, </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; margin-left:54%; text-indent:-2%; font-size:10pt; font-family:Times New Roman">/s/ Mayer Brown LLP </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; margin-left:54%; text-indent:-2%; font-size:10pt; font-family:Times New Roman">M<SMALL>AYER</SMALL> B<SMALL>ROWN</SMALL> LLP </P>
</BODY></HTML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
