8-K

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 10, 2007

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 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 10, 2007, GATX Corporation announced that it has signed a railcar purchase agreement with Trinity Industries, Inc., under which it will acquire 2,000 newly-manufactured tank cars, beginning in early 2008.

     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 10, 2007.

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, Chief Financial Officer (Duly Authorized Officer)

Date: December 10, 2007

EXHIBIT INDEX

Exhibit No.	Description	Method of Filing
99.1	News Release of GATX Corporation, dated December 10, 2007, announcing a railcar purchase agreement with Trinity Industries, Inc.	Filed Electronically

EX-99.1

Exhibit 99.1

FOR RELEASE: IMMEDIATE

GATX CORPORATION ANNOUNCES NEW RAILCAR ORDER

     CHICAGO, December 10 - GATX Corporation (NYSE:GMT) today announced that it has signed a railcar purchase agreement to acquire 2,000 newly-manufactured tank cars from Trinity Industries, Inc. (NYSE:TRN) over a two-year period beginning in early 2008, with an option for an additional 1,000 tank cars thereafter.

     GATX expects the Trinity order, together with other existing orders, to provide significant opportunity to enhance market share, meet customer demand and replace retired equipment with high quality tank cars, manufactured and configured according to strict GATX specifications.

     “We are pleased to continue our long-standing relationship with Trinity”, said James F. Earl, executive vice president and chief operating officer. “Trinity offers a full range of railcars and excels at manufacturing multiple car types simultaneously, providing GATX with the flexibility to choose tank car configurations based on then-current market conditions. This order will enable us to acquire railcars at favorable new car pricing and provides improved ability to meet the needs of key GATX customers.”

     GATX is one of the largest railcar and locomotive leasing companies in the world and one of the largest tank car and specialized railcar leasing companies in North America. GATX’s North American owned railcar fleet totaled approximately 111,000 cars on September 30, 2007.

COMPANY DESCRIPTION

     GATX Corporation (NYSE:GMT) provides lease financing and related services to customers operating rail, marine and other targeted assets. GATX is a leader in leasing transportation assets and controls one of the largest railcar fleets in the world. Applying over a century of operating experience and strong market and asset expertise, GATX provides quality assets and services to customers worldwide. GATX has been headquartered in Chicago, Illinois since its founding in 1898 and has traded on the New York Stock Exchange since 1916. For more information, visit the Company’s website at www.gatx.com.

FOR FURTHER INFORMATION CONTACT:
Rhonda S. Johnson
Director, Investor Relations
GATX Corporation
312-621-6262
rhonda.johnson@gatx.com

Investor, corporate, financial, historical financial, photographic and news release information may be found at www.gatx.com.

(12/10/07)

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