<SEC-DOCUMENT>0001246360-11-004001.txt : 20111110
<SEC-HEADER>0001246360-11-004001.hdr.sgml : 20111110
<ACCEPTANCE-DATETIME>20111110163010
ACCESSION NUMBER:		0001246360-11-004001
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20111104
FILED AS OF DATE:		20111110
DATE AS OF CHANGE:		20111110

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Ellman Thomas A.
		CENTRAL INDEX KEY:			0001534505

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-02328
		FILM NUMBER:		111195770

	MAIL ADDRESS:	
		STREET 1:		222 W. ADAMS ST.
		CITY:			CHICAGO
		STATE:			IL
		ZIP:			60606

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:		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>3
<SEQUENCE>1
<FILENAME>form.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0204</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2011-11-04</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

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

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001534505</rptOwnerCik>
            <rptOwnerName>Ellman Thomas A.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>222 W. ADAMS ST.</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>CHICAGO</rptOwnerCity>
            <rptOwnerState>IL</rptOwnerState>
            <rptOwnerZipCode>60606</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>false</isDirector>
            <isOfficer>true</isOfficer>
            <isTenPercentOwner>false</isTenPercentOwner>
            <isOther>false</isOther>
            <officerTitle>SVP &amp; Chief Commercial Officer</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock 401(k)</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>5399.755</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>401k shares</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>2532.825</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Stock-Settled Stock Appreciation Right</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>46.75</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2008-03-08</value>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <value>2014-03-08</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>3000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Stock-Settled Stock Appreciation Right</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>36.395</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2009-02-28</value>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <value>2015-02-28</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>4500</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Stock-Settled Stock Appreciation Right</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>16.685</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2010-03-04</value>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <value>2016-03-04</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>6200</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Stock-Settled Stock Appreciation Right</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>26.155</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2011-01-28</value>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <value>2017-01-28</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>5900</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Stock-Settled Stock Appreciation Right</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>33.935</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2012-01-27</value>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <value>2018-01-27</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>9300</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">33.33% of Stock-Settled Stock Appreciation Right granted may be exercised commencing 1 year from the date of the grant, an additional 33.33% commencing 2 years from the date of the grant and the remaining 33.34% commencing 3 years from the date of the grant.</footnote>
    </footnotes>

    <remarks>Exhibit List:

Exhibit 1 - Confirming Statement</remarks>

    <ownerSignature>
        <signatureName>Lisa M. Ibarra, by Power of Attorney on behalf of Thomas A. Ellman</signatureName>
        <signatureDate>2011-11-08</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>confirmingstatementtaetxt.txt
<TEXT>
											Exhibit 1

CONFIRMING STATEMENT



This Statement confirms that the undersigned Thomas A Ellman
has Authorized and designated either Deborah A Golden
Peter J Falconer, 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, 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, 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: November 8, 2011


/s/ Thomas A. Ellman
Thomas A. Ellman

olden
Peter J Falconer, Marland O Webb nor Lisa M Ibarra is assuming
any of the undersigneds responsibilities to comply with Se
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
