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The importance of Commonwealth Steel to the railroad industry was not overlooked by the industry and was underscored when two major locomotive companies, American Locomotive Company and Baldwin Locomotive Company, along with the American Steel Foundries, organized General Steel Castings Corporation in 1928 and subsequently purchased Commonwealth Steel.
American Car & Foundry predecessor Michigan-Peninsular Car had produced steel frame cars beginning in 1897, American Steel Foundries produced steel cars in 1900, and the Cambria Steel Company opened a car plant at Johnstown, Pennsylvania in 1901.