GATX Corporation leases, operates, manages, and remarkets assets in the rail and marine markets worldwide. The company operates through four segments: Rail North America, Rail International, Portfolio Management, and American Steamship Company (ASC). It leases tank and freight railcars, and locomotives for petroleum, chemical, food/agriculture, and transportation industries. The company also offers services, including the interior cleaning of railcars, the routine maintenance and repair of car body and safety appliances, regulatory compliance works, wheelset replacements, interior blast and lining operations, exterior blast and painting, and car stenciling. In addition, it leases aircraft spare engines and liquefied gas-carrying vessels, as well as manages portfolios of assets for third parties. Further, the company operates a fleet of vessels that provide waterborne transportation of dry bulk commodities, such as iron ore, coal, limestone aggregates, and metallurgical limestone for the steel making, automobile manufacturing, electricity generation, and non-residential construction markets. As of December 31, 2019, it operated a fleet of approximately 147,000 railcars; 601 four-axle and 28 six-axle locomotives; and 11 vessels. The company was founded in 1898 and is headquartered in Chicago, Illinois.