GATX Corporation is a railcar lessor that owns fleets in North America, Europe, and Asia.

In addition, jointly with Rolls-Royce Limited, it owns one of the largest aircraft spare engine lease portfolios.

In 1916, it changed its name to General American Tank Car Corp. and became a public company via an initial public offering, and in 1933, it was renamed General American Transportation Corp.[2] In 1949, the company worked with designer Russel Wright to develop "Meladur", a melamine dinnerware.

[7] In November 2018, the company announced an agreement to acquire up to 3,100 railcars from ECN Capital for up to $229 million.

[9] In December 2020, the company acquired Trifleet Leasing Holding B.V., the fourth largest global tank container lessor.