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): December 17, 2008

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, including zip code)

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

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 8.01 Other Events.

     On December 17, 2008, GATX Corporation announced that it has purchased the North American railcar fleet of Allco Finance Group Limited. A copy of the news release announcing this action is included as an exhibit to this report.

Item 9.01 Financial Statements and Exhibits.

     (d) Exhibits

          99.1   News Release dated December 17, 2008.

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 

Senior Vice-President and
Chief Financial Officer
(Duly Authorized Officer) 

Date: December 18, 2008

EXHIBIT INDEX

Exhibit No.	Description	Method of Filing
99.1	News Release of GATX Corporation, dated December 17, 2008, announcing the acquisition of the North American railcar fleet of Allco Finance Group Limited.	Filed Electronically