GATX Corporation, together its subsidiaries, operates as railcar leasing company in the United States, Canada, Mexico, Europe, and India.

It operates through three segments: Rail North America, Rail International, and Portfolio Management.

The company leases tank and freight railcars, and locomotives for petroleum, chemical, food/agriculture, and transportation industries.

It also offers maintenance services, including the interior cleaning of railcars, routine maintenance and repair of car body and safety appliances, regulatory compliance works, wheelset replacements, interior blast and lining, exterior blast and painting, and car stenciling services.

In addition, the company manufactures commercial aircraft jet engines and leases aircraft spare engines; and owns and manages tank containers that are leased to chemical, industrial gas, energy, food, cryogenic and pharmaceutical industries, and tank container operators, as well as provides tank container sourcing, remarketing, and inspection and maintenance services.

As of December 31, 2022, it owned and operated a fleet of approximately 144,000 railcars; 501 four-axle and 43 six-axle locomotives; and 22,000 tank containers.

GATX Corporation was founded in 1898 and is headquartered in Chicago, Illinois.