Founded in 1898, the Gatx Corporation operated one of the largest fleet of United States flagged vessels on the Great Lakes.

The company also services the North American rail market with a fleet of more than 122,000 railcars. The Locomotive Group has a fleet of more than 600 four-axle locomotives on lease to railroads and industrial users

Their subsides include the Rail North America Corporation, Rail International, and the American Steamship Company.