EXHIBIT 24 POWER OF ATTORNEY The undersigned director of GATX Corporation, a New York corporation, does hereby constitute and appoint Robert C. Lyons, Deborah A. Golden and William M. Muckian or any of them, attorneys and agents of the undersigned, with full power and authority to sign in such director's name, and on behalf of GATX Corporation, the 2006 Annual Report on Form 10-K under the Securities Exchange Act of 1934, together with any amendments thereto, hereby ratifying and confirming all that said attorneys and agents and each of them may do by virtue hereof. IN WITNESS WHEREOF, the undersigned has hereunto set his hand and seal. /s/ Rod F. Dammeyer --------------------------------- Rod F. Dammeyer Director Date: February 23, 2007 ------------------------ POWER OF ATTORNEY The undersigned director of GATX Corporation, a New York corporation, does hereby constitute and appoint Robert C. Lyons, Deborah A. Golden and William M. Muckian or any of them, attorneys and agents of the undersigned, with full power and authority to sign in such director's name, and on behalf of GATX Corporation, the 2006 Annual Report on Form 10-K under the Securities Exchange Act of 1934, together with any amendments thereto, hereby ratifying and confirming all that said attorneys and agents and each of them may do by virtue hereof. IN WITNESS WHEREOF, the undersigned has hereunto set his hand and seal. /s/ James M. Denny --------------------------------- James M. Denny Director Date: February 23, 2007 ------------------------ POWER OF ATTORNEY The undersigned director of GATX Corporation, a New York corporation, does hereby constitute and appoint Robert C. Lyons, Deborah A. Golden and William M. Muckian or any of them, attorneys and agents of the undersigned, with full power and authority to sign in such director's name, and on behalf of GATX Corporation, the 2006 Annual Report on Form 10-K under the Securities Exchange Act of 1934, together with any amendments thereto, hereby ratifying and confirming all that said attorneys and agents and each of them may do by virtue hereof. IN WITNESS WHEREOF, the undersigned has hereunto set his hand and seal. /s/ Richard Fairbanks --------------------------------- Richard Fairbanks Director Date: February 23, 2007 ------------------------ POWER OF ATTORNEY The undersigned director of GATX Corporation, a New York corporation, does hereby constitute and appoint Robert C. Lyons, Deborah A. Golden and William M. Muckian or any of them, attorneys and agents of the undersigned, with full power and authority to sign in such director's name, and on behalf of GATX Corporation, the 2006 Annual Report on Form 10-K under the Securities Exchange Act of 1934, together with any amendments thereto, hereby ratifying and confirming all that said attorneys and agents and each of them may do by virtue hereof. IN WITNESS WHEREOF, the undersigned has hereunto set his hand and seal. /s/ Deborah M. Fretz --------------------------------- Deborah M. Fretz Director Date: February 21, 2007 ------------------------ POWER OF ATTORNEY The undersigned director of GATX Corporation, a New York corporation, does hereby constitute and appoint Robert C. Lyons, Deborah A. Golden and William M. Muckian or any of them, attorneys and agents of the undersigned, with full power and authority to sign in such director's name, and on behalf of GATX Corporation, the 2006 Annual Report on Form 10-K under the Securities Exchange Act of 1934, together with any amendments thereto, hereby ratifying and confirming all that said attorneys and agents and each of them may do by virtue hereof. IN WITNESS WHEREOF, the undersigned has hereunto set his hand and seal. /s/ Marla C. Gottschalk --------------------------------- Marla C. Gottschalk Director Date: February 23, 2007 ------------------------ POWER OF ATTORNEY The undersigned director of GATX Corporation, a New York corporation, does hereby constitute and appoint Robert C. Lyons, Deborah A. Golden and William M. Muckian or any of them, attorneys and agents of the undersigned, with full power and authority to sign in such director's name, and on behalf of GATX Corporation, the 2006 Annual Report on Form 10-K under the Securities Exchange Act of 1934, together with any amendments thereto, hereby ratifying and confirming all that said attorneys and agents and each of them may do by virtue hereof. IN WITNESS WHEREOF, the undersigned has hereunto set his hand and seal. /s/ Mark G. McGrath --------------------------------- Mark G. McGrath Director Date: February 23, 2007 ------------------------ POWER OF ATTORNEY The undersigned director of GATX Corporation, a New York corporation, does hereby constitute and appoint Robert C. Lyons, Deborah A. Golden and William M. Muckian or any of them, attorneys and agents of the undersigned, with full power and authority to sign in such director's name, and on behalf of GATX Corporation, the 2006 Annual Report on Form 10-K under the Securities Exchange Act of 1934, together with any amendments thereto, hereby ratifying and confirming all that said attorneys and agents and each of them may do by virtue hereof. IN WITNESS WHEREOF, the undersigned has hereunto set his hand and seal. /s/ Michael E. Murphy --------------------------------- Michael E. Murphy Director Date: February 20, 2007 ------------------------ POWER OF ATTORNEY The undersigned director of GATX Corporation, a New York corporation, does hereby constitute and appoint Robert C. Lyons, Deborah A. Golden and William M. Muckian or any of them, attorneys and agents of the undersigned, with full power and authority to sign in such director's name, and on behalf of GATX Corporation, the 2006 Annual Report on Form 10-K under the Securities Exchange Act of 1934, together with any amendments thereto, hereby ratifying and confirming all that said attorneys and agents and each of them may do by virtue hereof. IN WITNESS WHEREOF, the undersigned has hereunto set his hand and seal. /s/ Casey J. Sylla --------------------------------- Casey J. Sylla Director Date: February 23, 2007 ------------------------