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The GMD GMDH-1 was an experimental diesel-hydraulic switching locomotive built by General Motors Diesel of Canada. Four examples were built. It was a double-ended, center-cab design. 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).