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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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<SEC-DOCUMENT>0001014831-03-000004.txt : 20030502
<SEC-HEADER>0001014831-03-000004.hdr.sgml : 20030502
<ACCEPTANCE-DATETIME>20030502170926
ACCESSION NUMBER:		0001014831-03-000004
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20030501
FILED AS OF DATE:		20030502

SUBJECT COMPANY:	

	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:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-02328
		FILM NUMBER:		03680405

	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:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MARSH MILES L
		CENTRAL INDEX KEY:			0001014831
		RELATIONSHIP:				DIRECTOR

	FILING VALUES:
		FORM TYPE:		4

	BUSINESS ADDRESS:	
		STREET 1:		20 SOUTH CLARK STREET
		CITY:			CHICAGO
		STATE:			IL
		ZIP:			60603
		BUSINESS PHONE:		3125807822

	MAIL ADDRESS:	
		STREET 1:		20 SOUTH CLARK STREET
		CITY:			CHICAGO
		STATE:			IL
		ZIP:			60603
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgar.txt
<DESCRIPTION>FORM 4 - 05-01-2003
<TEXT>
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549
FORM 4
STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP
( ) Check this box if no longer subject to Section 16.
Form 4 or Form 5 obligations may continue. See Instructions 1(b).
1. Name and Address of Reporting Person
   Miles L. Marsh
   20 South Clark Street
Suite 2222
   IL, Chicago 60603
2. Issuer Name and Ticker or Trading Symbol
   GATX CORPORATION (GMT)

3. IRS or Social Security Number of Reporting Person (Voluntary)
   ###-##-####
4. Statement for Month/Day/Year
   5/1/2003
5. If Amendment, Date of Original (Month/Day/Year)

6. Relationship of Reporting Person(s) to Issuer (Check all applicable)
   (X) Director ( ) 10% Owner ( ) Officer (give title below) ( ) Other
   (specify below)

7. Individual or Joint/Group Filing (Check Applicable Line)
   (X) Form filed by One Reporting Person
   ( ) Form filed by More than One Reporting Person
<TABLE>
<CAPTION>
___________________________________________________________________________________________________________________________________
 Table I -- Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned                                                 |
___________________________________________________________________________________________________________________________________|
1. Title of Security|2.    |2A.   |3.    |4.Securities Acquired (A)         |5.Amount of        |6.Dir |7.Nature of Indirect       |
                    |Trans-|Exec- |Trans |  or Disposed of (D)              |  Securities       |ect   |  Beneficial Ownership     |
                    |action|ution |action|                                  |  Beneficially     |(D)or |                           |
                    |      |      |    | |                  | A/|           |  Owned Following  |Indir |                           |
                    |Date  | Date |Code|V|    Amount        | D |    Price  |  Reported Trans(s)|ect(I)|                           |
___________________________________________________________________________________________________________________________________|
<S>                 <C>    <C>    <C>  <C><C>               <C> <C>         <C>                 <C>    <C>
Common Stock        |5/1/ 2|      |A   | |766.7474 1        |A  |18.585     |10086.1212 2       |D     |                           |
                    |003   |      |    | |                  |   |           |                   |      |                           |
- -----------------------------------------------------------------------------------------------------------------------------------|
___________________________________________________________________________________________________________________________________|
<CAPTION>
___________________________________________________________________________________________________________________________________|
 Table II -- Derivative Securitites Acquired, Disposed of, or Beneficially Owned                                                   |
___________________________________________________________________________________________________________________________________|
1.Title of   |2.Con-  |3.     |3A.   |4.    |5.Number of De |6.Date Exer|7.Title and Amount  |8.Price|9.Number    |10.|11.Nature of|
  Derivative |version |Trans- |Deemed|Trans-| rivative Secu |cisable and|  of Underlying     |of Deri|of Deriva   |Dir|Indirect    |
  Security   |or Exer |action |      |action| rities Acqui  |Expiration |  Securities        |vative |tive        |ect|Beneficial  |
             |cise    |       |Execu-|      | red(A) or Dis |Date(Month/|                    |Secu   |Securities  |(D)|Ownership   |
             |Price of|       |ution |      | posed of(D)   |Day/Year)  |                    |rity   |Benefi      |or |            |
             |Deriva- |       |      |      |               |Date |Expir|                    |       |ficially    |Ind|            |
             |tive    |       |      |      |           | A/|Exer-|ation|   Title and Number |       |Owned Follow|ire|            |
             |Secu-   |(Month/|(Month|    | |           | D |cisa-|Date |   of Shares        |       |ing Reported|ct |            |
             |rity    |Day/   |/Day/ |Code|V|  Amount   |   |ble  |     |                    |       |Trans-      |(I)|            |
             |        |Year)  |Year) |    | |           |   |     |     |                    |       |action(s)   |   |            |
___________________________________________________________________________________________________________________________________|
<S>          <C>      <C>     <C>    <C>  <C><C>        <C> <C>   <C>   <C>          <C>     <C>     <C>          <C> <C>
             |        |       |      |    | |           |   |     |     |            |       |       |            |   |            |
___________________________________________________________________________________________________________________________________|
</TABLE>
Explanation of Responses:
1. Includes that portion of the quarterly payment of the annual directors' fee
(766.7474 shares) credited to an account established for each director under
the GATX Directors' Phantom Stock Plan ("Phantom Stock Plan") which in each
case will be settled in
 common stock upon the expiration of the director's service on the Board.
2. Includes 168.3619 shares acquired pursuant to a dividend reinvestment
feature of the GATX Phantom Stock Plan.
SIGNATURE OF REPORTING PERSON
Miles L. Marsh
Miles L. Marsh

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