GATX CORP — Director's Dealing 2004

May 5, 2004

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: GATX CORP (GMT)
CIK: 0000040211
Period of Report: 2004-05-03

Reporting Person: DENNY JAMES M (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2004-05-03	Common Stock	A	900.61	$23.595	Acquired	16193.04	Direct

Footnotes

F1: Includes that portion of (a) the quarterly payment of the annual directors' fee (603.9415 shares) credited to an account established for each director under the GATX Directors' Phantom Stock Plan ("Phantom Stock Plan") and (b) the annual retainer and meeting fee (296.6730 shares) which the reporting person elected to invest in units of phantom stock under the Directors' Deferred Fee Plan ("Deferred Fee Plan"), which in each case will be settled in common stock upon the expiration of the director's service on the Board.

F2: Includes 97.6875 shares acquired pursuant to a dividend reinvestment feature of the GATX Phantom Stock Plan and 24.6000 shares ac
quired pursuant to a dividend reinvestment feature of the Deferred Fee Plan.