Diesel locomotives were introduced to Australian railways from the early 1950s. Most units were of local design and construction, using imported British or American technology and power equipment. The three major firms were Clyde Engineering partnered with GM-EMD, Goninan with General Electric, and AE Goodwin (later Comeng) with the American Locomotive Company (ALCO). The major British company was English Electric, with Swiss firm Sulzer also supplying some equipment. This continues today, with Downer Rail and UGL Rail the modern incarnations of Clyde and Goninan respectively.