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): May 9, 2006

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 7.01 Regulation FD Disclosure

The following information is furnished pursuant to “Regulation FD Disclosure”. Neither this report nor the information contained in Exhibit 99.1 shall be deemed “filed” for purposes of Section 18 of the Securities and Exchange Act of 1934, as amended, (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference into any filing under the Securities Act of 1933 or the Exchange Act, regardless of any general incorporation language in such filing.

On May 9, 2006 GATX Corporation management will present an overview of GATX’s Rail operations at the Bear Stearns & Co. Inc. Global Transportation Conference in New York. Slides used in the presentation are available on GATX’s website at www.gatx.com

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 7.01:

99.1 Presentation by GATX management at Bear Stearns & Co. Inc. Global Transportation Conference in New York on May 9, 2006.

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: May 9, 2006

EXHIBIT INDEX

Exhibit No.	Description	Method of Filing
99.1	GATX Presentation at Bear Stearns & Co. Inc. Global Transportation Conference on May 9, 2006.