The GMD GMDH-1 was an experimental diesel-hydraulic, center-cab, switching locomotive built by General Motors Diesel of Canada. Four examples were built. The first two locomotives were each fitted with a pair of 6-cylinder Detroit Diesel series 110 engines giving 600 horsepower (450 kW), while the second pair had two series 71 engines developing 800 hp (600 kW). #A1812, meanwhile, was purchased by contracting firm as their #28151.It was re-gauged to 5 ft 6 in (1,676 mm) gauge and shipped to Pakistan for the building of the Mangla Dam, where it still resides.