UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT
Pursuant to Section 13 OR 15 (d) of the Securities Exchange Act of 1934

Date of Report (Date of Earliest Event Reported): October 28, 2004

GATX Corporation

(Exact name of registrant as specified in its charter)

New York	1-2328	36-1124040
(State or other jurisdiction of	(Commission File	(IRS Employer
incorporation)	Number)	Identification No.)

500 West Monroe Street
Chicago, Illinois	60661-3676
(Address of principal executive offices)	(Zip Code)

Registrant’s telephone number, including area code (312) 621-6200

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

o Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

o Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

o Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

o Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Item 7.01. Regulation FD Disclosure (Item 12, Results of Operations and Financial Condition).

In accordance with SEC Release No. 33-8216, the following information, intended to be furnished under “Item 12. Results of Operations and Financial Condition,” is instead furnished under “Item 9. Regulation FD Disclosure.” The information in the Form 8-K and the Exhibits attached hereto shall not be deemed “filed” for purposes of Section 18 of the Securities and Exchange Act of 1934, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, except as shall be expressly set forth by specific reference in such filing.

     On October 28, 2004, GATX Corporation issued a press release that included unaudited financial statements and supplemental financial information for its third quarter ended September 30, 2004. A copy of the press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

Item 9.01. Financial Statements and Exhibits.

(c) Exhibits

99.1 GATX Corporation press release dated October 28, 2004.

SIGNATURE

     Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

	GATX CORPORATION
	(Registrant)
	/s/ Brian Kenney
	Brian A. Kenney
	President and
	Chief Financial Officer
	(Duly Authorized Officer)
Date: October 28, 2004

INDEX TO EXHIBITS

Exhibit No.		Method of Filing
99.1	GATX Corporation press release dated October 28, 2004.	Filed Electronically