The EMD SW1500 was a 1,500hp diesel locomotive intended for switching service and built by General Motors' Electro-Motive Division between June 1966 and January 1974. 808 units were constructed during that period. It was closely related to the less powerful EMD SW1000 model, forming a line of switchers powered by the new EMD 645 engine. The SW1500 replaced the SW1200 in the EMD product line, and was in turn replaced by the MP15DC.
The SW1500 was a much bigger locomotive than its predecessor the SW1200, with a bulkier frame, larger cab and bigger hood. In many respects it was approaching a road switcher in abilities. While the SW1500 came as standard with AAR switcher trucks, the majority of them were delivered with the optional Flexicoil trucks which permitted speeds up to 60 mph (100 km/h). The SW1500 was, in fact, often operated as a road-switcher for branchline service, and continues to operate in this role today.