The GMD GMDH-3 was an experimental diesel-hydraulic switching locomotive built in January 1960 by General Motors Diesel of Canada. Only one example was built, with GMD serial number A1813.The locomotive was essentially the GMDH-1 design but with only a single hood, a single engine and an end cab, mounted on a six-wheel chassis. The locomotive served as a demonstrator for GMD, bearing number #275, between 1960 and 1962, including a period in Egypt, but no sales resulted.