GATX Corporation is a global railcar lessor, owning fleets in North America, Europe, and Asia. In addition, the Company operates fleet of the United States-flagged vessels on the Great Lakes and jointly with Rolls-Royce plc, it owns aircraft spare engine lease portfolios in the world. It operates through four business segments: Rail North America, Rail International, American Steamship Company (ASC), and Portfolio Management. As of December 31, 2016, it owned fleet of approximately 146,300 railcars. It offers customers leasing, maintenance, asset, financial, and management expertise. It leases tank cars, freight cars, and locomotives in North America, tank cars and freight cars in Europe and freight cars in India and Russia. As of December 31, 2016, it also had an ownership interest in an affiliate investment that owned approximately 2,200 railcars, and it managed approximately 400 railcars for other third-party owners.