GATX (GATX) 10-Q 2010 Q2 Quarterly report

Exhibit 32

GATX CORPORATION AND SUBSIDIARIES

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

     In connection with the Quarterly Report of GATX Corporation (the “Company”) on Form 10-Q for the period ending June 30, 2010, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), each of the undersigned officers of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

     (1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

     (2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ Brian A. KenneyBrian A. Kenney	/s/ Robert C. LyonsRobert C. Lyons
Chairman, President and	Senior Vice President and
Chief Executive Officer	Chief Financial Officer

July 28, 2010

     This certification accompanies the Report pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 and shall not be deemed filed by GATX Corporation for purposes of Section 18 of the Securities Exchange Act of 1934, as amended.

     A signed original of this written statement required by Section 906 has been provided to GATX Corporation and will be retained by GATX Corporation and furnished to the Securities and Exchange Commission or its staff upon request.