GMD-1 Locomotive, Undecorated. Long Hood Forward Unit. Reskins permitted with permission of me, the author, Dave Snow.
The GMD GMD-1 is a diesel locomotive originally produced by General Motors Diesel (GMD), the Canadian subsidiary of General Motors Electro-Motive Division, between August 1958 and April 1960. This switcher locomotive was powered by a 12-cylinder EMD 567C diesel engine, capable of producing 1,200 horsepower. The GMD-1 was built on either Flexicoil A1A-A1A (for light rail prairie branchlines) or Flexicoil B-B trucks. 101 examples of this locomotive were built for Canadian railways. 96 went to Canadian National Railway and the remaining 5 went to Northern Alberta Railways (that later became part of CN's fleet when they acquired majority interest in NAR).
According to original blueprints of the locomotive from GMD, CN's own equipment diagram books, and the original GMD manual for this locomotive, it is consistently referred to as a GMD-1 rather than a GMD1. GMD1 has been a common misnomer since the 1970s.