<SEC-DOCUMENT>0001562180-23-006069.txt : 20230731
<SEC-HEADER>0001562180-23-006069.hdr.sgml : 20230731
<ACCEPTANCE-DATETIME>20230731180356
ACCESSION NUMBER:		0001562180-23-006069
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20230728
FILED AS OF DATE:		20230731
DATE AS OF CHANGE:		20230731

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Bausch Shelley J
		CENTRAL INDEX KEY:			0001714460

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-02328
		FILM NUMBER:		231128848

	MAIL ADDRESS:	
		STREET 1:		15710 JOHN F. KENNEDY BLVD., SUITE 300
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77032

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:		233 SOUTH WACKER DRIVE
		CITY:			CHICAGO
		STATE:			IL
		ZIP:			60606-7147
		BUSINESS PHONE:		3126216200

	MAIL ADDRESS:	
		STREET 1:		233 SOUTH WACKER DRIVE
		CITY:			CHICAGO
		STATE:			IL
		ZIP:			60606-7147

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	GENERAL AMERICAN TRANSPORTATION CORP
		DATE OF NAME CHANGE:	19750722
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>primarydocument.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2023-07-28</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

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

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001714460</rptOwnerCik>
            <rptOwnerName>Bausch Shelley J</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O 233 S. WACKER DR.</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>CHICAGO</rptOwnerCity>
            <rptOwnerState>IL</rptOwnerState>
            <rptOwnerZipCode>60606</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>true</isDirector>
            <isOfficer>false</isOfficer>
            <isTenPercentOwner>false</isTenPercentOwner>
            <isOther>false</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0.00</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes></footnotes>

    <remarks>Exhibit List:

Exhibit 1 - Confirming Statement</remarks>

    <ownerSignature>
        <signatureName>Lisa M. Ibarra, by Power of Attorney on behalf of Shelley J. Bausch</signatureName>
        <signatureDate>2023-07-31</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>sjb-confirmingstatement.txt
<DESCRIPTION>CONFIRMING STATEMENT - SJB
<TEXT>
Exhibit 1

CONFIRMING STATEMENT



This Statement confirms that the undersigned, Shelley J. Bausch, has authorized
and designated Brian L. Glassberg, Alan R. Haguewood and 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 Brian
L. Glassberg, Alan R. Haguewood 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 Brian L. Glassberg, nor Alan R. Haguewood nor
Lisa M. Ibarra is assuming any of the undersigneds responsibilities to comply
with Section 16 of the Securities Exchange Act of 1934.




Date: June 12, 2023




/s/ Shelley J. Bausch
Shelley J. Bausch
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
