Diesel Locomotive Works (DLW) is production unit under the ministry of railways. This was setup in collaboration with American locomotive company (ALCO) USA in 1961 and the first locomotive was rolled out in 1964. This unit produces diesel electronic locomotives for Indian railways and other customers in India and Abroad. Subsequently a contract for transfer of technology of 4000 HP Microprocessor Controlled AC/AC Freight (GT 46 MAC) / passenger (GT 46 PAC) locomotives and family of 710 engines has been signed with electro motive division of general motors of USA for manufacture in DLW. The production of these locomotives has now started and thus DLW is the only manufacturers of Diesel Electric Locomotives with both ALCO and General motors technologies in the world.