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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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<SEC-DOCUMENT>0001246360-07-002471.txt : 20070730
<SEC-HEADER>0001246360-07-002471.hdr.sgml : 20070730
<ACCEPTANCE-DATETIME>20070730174914
ACCESSION NUMBER:		0001246360-07-002471
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20070727
FILED AS OF DATE:		20070730
DATE AS OF CHANGE:		20070730

ISSUER:		

	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

	BUSINESS ADDRESS:	
		STREET 1:		500 W MONROE ST
		CITY:			CHICAGO
		STATE:			IL
		ZIP:			60661
		BUSINESS PHONE:		3126216200

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	GENERAL AMERICAN TRANSPORTATION CORP
		DATE OF NAME CHANGE:	19750722

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Sutherland David
		CENTRAL INDEX KEY:			0001349227

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-02328
		FILM NUMBER:		071010585

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		(630) 810-4763

	MAIL ADDRESS:	
		STREET 1:		SUITE 500
		STREET 2:		650 WARRENVILLE ROAD
		CITY:			LISLE
		STATE:			IL
		ZIP:			60532
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>form.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2007-07-27</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0000040211</issuerCik>
        <issuerName>GATX CORP</issuerName>
        <issuerTradingSymbol>GMT</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001349227</rptOwnerCik>
            <rptOwnerName>Sutherland David</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O 500 W. MONROE ST.</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>CHICAGO</rptOwnerCity>
            <rptOwnerState>IL</rptOwnerState>
            <rptOwnerZipCode>60661</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>true</isDirector>
            <isOfficer>false</isOfficer>
            <isTenPercentOwner>false</isTenPercentOwner>
            <isOther>false</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <ownerSignature>
        <signatureName>Lisa M. Ibarra, by Power of Attorney on behalf of David S. Sutherland</signatureName>
        <signatureDate>2007-07-27</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>confirmingstatementdss.txt
<TEXT>
CONFIRMING STATEMENT


This Statement confirms that the undersigned, David S. Sutherland, has
authorized and designated either Deborah A. Golden, Peter J. Falconer,
Bronna L. Wasserman, Marland O. Webb or Lisa M. Ibarra to execute and
file on the undersigneds behalf all Forms 3, 4 and 5 including any
amendments thereto that the undersigned may be required to file with
the US Securities and Exchange Commission as a result of the undersigneds
ownership of or transactions in securities of GATX Corporation.  The
authority of Deborah A. Golden, Peter J. Falconer, Bronna L. Wasserman,
Marland O. Webb and Lisa M. Ibarra under this Statement shall continue
until the undersigned is no longer required to file Forms 3, 4 and 5 with
regard to the undersigneds ownership of or transactions in securities of
GATX Corporation, unless earlier revoked in writing.  The undersigned
acknowledges that neither Deborah A. Golden, Peter J. Falconer, Bronna L.
Wasserman, Marland O. Webb, nor Lisa M. Ibarra is assuming any of the
undersigneds responsibilities to comply with Section 16 of the
Securities Exchange Act of 1934.



Date: July 27, 2007


_______________________________
/s/ David S. Sutherland

</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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