EXHIBIT 31a


CERTIFICATION OF PRINCIPAL EXECUTIVE OFFICER

I, Ronald H. Zech, certify that:

1.   I have reviewed this Quarterly Report on Form 10-Q of GATX Corporation;

2.   Based on my knowledge, this quarterly report does not contain any untrue
     statement of a material fact or omit to state a material fact necessary to
     make the statements made, in light of the circumstances under which such
     statements were made, not misleading with respect to the period covered by
     this quarterly report;

3.   Based on my knowledge, the financial statements, and other financial
     information included in this quarterly report, fairly present in all
     material respects the financial condition, results of operations and cash
     flows of the registrant as of, and for, the periods presented in this
     quarterly report;

4.   The registrant's other certifying officer and I are responsible for
     establishing and maintaining disclosure controls and procedures (as defined
     in Exchange Act Rules 13(a)-15(e) and 15(d)-15(e)) for the registrant and
     we have:

     a)   Designed such disclosure controls and procedures or caused such
          disclosure controls to be designed under our supervision to ensure
          that material information relating to the registrant, including its
          consolidated subsidiaries, is made known to us by others within these
          entities, particularly during the period in which this quarterly
          report is being prepared;

     b)   Evaluated the effectiveness of the registrant's disclosure controls
          and procedures and presented in this report our conclusions about the
          effectiveness of the disclosure controls and procedures, as of the end
          of the period covered by this report based on such evaluation; and

     c)   Disclosed in this report any change in the registrant's internal
          control over financial reporting that occurred during the registrant's
          most recent fiscal quarter (the registrant's fourth fiscal quarter in
          the case of an annual report) that has materially affected, or is
          reasonably likely to materially affect, the registrant's internal
          control over financial reporting; and

5.   The registrant's other certifying officer and I have disclosed, based on
     our most recent evaluation, to the registrant's auditors and the audit
     committee of the registrant's board of directors (or persons performing the
     equivalent function):

     a)   All significant deficiencies and material weaknesses in the design or
          operation of internal controls over financial reporting which are
          reasonably likely to adversely affect the registrant's ability to
          record, process, summarize and report financial information; and

     b)   Any fraud, whether or not material, that involves management or other
          employees who have a significant role in the registrant's internal
          control over financial reporting.



     August 13, 2003

                                            /s/ Ronald H. Zech
                              -----------------------------------------------
                                              Ronald H. Zech
                              Chairman, President and Chief Executive Officer