CONFIRMING STATEMENT


This Statement confirms that the undersigned, Marla C. Gottschalk,
has authorized and designated either Deborah A. Golden, John H. Bomgardner,
Bronna L. Wasserman, Marland O. Webb or Lisa M. Ibarra to execute and
file on the undersigneds behalf all Forms 3, 4 and 5, including any
amendments thereto, that the undersigned may be required to file with
the US Securities and Exchange Commission as a result of the undersigneds
ownership of or transactions in securities of GATX Corporation. The authority
of Deborah A. Golden, John H. Bomgardner, Bronna L. Wasserman, Marland O.
Webb and Lisa M. Ibarra under this Statement shall continue until the
undersigned is no longer required to file Forms 3, 4 and 5 with regard to
the undersigneds ownership of or transactions in securities of GATX
Corporation, unless earlier revoked in writing. The undersigned acknowledges
that neither Deborah A. Golden, John H. Bomgardner, Bronna L. Wasserman,
Marland O. Webb, nor Lisa M. Ibarra is assuming any of the undersigneds
responsibilities to comply with Section 16 of the Securities Exchange Act
of 1934.



Date: July 26, 2006


____________________________________
/s/ Marla C. Gottschalk