The GP40 is a 4-axle diesel-electric road-switcher locomotive built by General Motors, Electro-Motive Division between November 1965 and December 1971. It has an EMD 645E3 16-cylinder engine generating 3,000 hp
EMD GP40 #415 is one of an order of 3 placed by the Washington Northern in 1971. These were numbered 411-414. Two more units, numbers 415 & 416 were acquired second-hand in 1981. Can be seen throughout the system.