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Description of Business	9 Months Ended
Sep. 30, 2012
Description of Business	NOTE 1. Description of Business GATX Corporation (“GATX” or the “Company”) leases, operates, manages and remarkets long-lived, widely-used assets primarily in the rail and marine markets. GATX also invests in joint ventures that complement existing business activities. Headquartered in Chicago, Illinois, GATX has three financial reporting segments: Rail, American Steamship Company (“ASC”) and Portfolio Management.

Description of Business

9 Months Ended

Sep. 30, 2012

NOTE 1. Description of Business

GATX Corporation (“GATX” or the “Company”) leases, operates, manages and remarkets long-lived, widely-used assets primarily in the rail and marine markets. GATX also invests in joint ventures that complement existing business activities. Headquartered in Chicago, Illinois, GATX has three financial reporting segments: Rail, American Steamship Company (“ASC”) and Portfolio Management.