GATX CORP — Director's Dealing 2004

May 28, 2004

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: GATX CORP (GMT)
CIK: 0000040211
Period of Report: 2004-05-27

Reporting Person: LYONS ROBERT C (VP - Investor Relations)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2004-05-27	Common Stock	S	1029.00	$23.85	Disposed	253.75	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock - 401(k)	1648.24	Indirect