GATX Corporation (GATX) leases, operates, manages and remarkets long-lived, widely-used assets, primarily in the rail and marine markets. The Company operates through four primary business segments: Rail North America, Rail International, American Steamship Company (ASC) and Portfolio Management. GATX and its rail affiliates lease tank cars, freight cars and locomotives in North America, Europe and India. As of December 31, 2012, GATX's wholly-owned fleet consisted of approximately 131,000 railcars and 561 locomotives. GATX also has an ownership interest in approximately 30,000 railcars through investments in affiliated companies. Affiliate fleets consist primarily of freight and intermodal railcars. In addition, GATX manages fleets for an affiliate and other third-party owners of approximately 5,200 railcars.