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.
A number of GMD-1 units have been sold off in the 1990s and 2000s to rebuilders, leasers, regional and shortline railways. A few were acquired by Ferrocarriles de Cuba. Oregon Pacific Railroad acquired Canadian National #1045, and is now numbered OPR #1413.