ATH-1260 EMD SD40-2 With DCC & Sound, WAMX #4050 Diesel LocomotivePROTOTYPE SPECIFIC INFORMATION The SD40 2 was introduced in January 1972 as part of EMDs Dash 2 series, responding to competing products from GE and ALCO. Reliability and versatility of the 3,000 horsepower SD40 2 made it the best selling model in EMDs history and the standard of the industry for several decades after its introduction. The SD40 2 was an improvement over the SD40, with modular electronic control systems similar to those of the