GATX CORP — Director's Dealing 2006

May 3, 2006

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: GATX CORP (GMT)
CIK: 0000040211
Period of Report: 2006-05-01

Reporting Person: FRETZ DEBORAH M (N/A)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2006-05-01	Common Stock	A	306.9467	$46.425	Acquired	15603.484	Direct

Footnotes

F1: Includes 75.6053 shares acquired pursuant to a dividend reinvestment feature of the GATX Directors' Phantom Stock Plan ("Phantom Stock Plan").

F2: Includes that portion of the quarterly payment of the annual directors' fee (306.9467 shares) credited to an account established for each director under the Phantom Stock Plan which in each case will be settled in common stock upon the expiration of the director's service on the Board.