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): January 27, 2005

GATX Corporation

(Exact name of registrant as specified in its charter)

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

500 West Monroe Street
Chicago, Illinois
(Address of principal executive offices) 60661-3676
(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 obligation of the registrant under any of the following provisions:

o  Written communication 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 2.02 Results of Operations and Financial Condition.

The following information is furnished pursuant to Item 2.02 “Results of Operations and Financial Condition” and shall not be deemed “filed” for the purposes of Section 18 of the Securities and Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that section. On January 27, 2005 GATX Corporation issued a press release that included unaudited financial statements and supplemental financial information for the three month period ended December 31, 2004 and for the full year ended December 31, 2004. A copy of the press release is attached hereto as Exhibit 99.1.

Item 9.01. Financial Statements and Exhibits.

     (c) Exhibits

           The following exhibit is furnished with this Current Report on Form 8-K pursuant to Item 2.02:

                          99.1 Press Release dated January 27, 2005.

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/ Robert C. Lyons  

Robert C. Lyons 

Vice-President, Chief
Financial Officer
(Duly Authorized Officer) 

Date: January 27, 2005

EXHIBIT INDEX

Exhibit No.	Description	Method of Filing
99.1	Press Release of GATX Corporation, dated January 27, 2005 reporting GATX Corporation’s financial results for the three month period ended December 31, 2004 and the full year ended December 31, 2004.	Filed Electronically