GM "old-look" Transit Bus - Model Designations

Model Designations

The model designations used for GM "old-look" buses consisted of a series of two or three letters followed by a series of four numbers (for example, TDH-4512). The letters and numbers gave a basic description of the type of bus as follows:

Type Fuel Transmission Nominal seating capacity Series
T = transit bus
  • GM also built parlor coaches (designated by P) and, beginning in the 1960s, suburban buses (S), however neither prefix was used for any "old-look" models).
 D = diesel
G = gasoline		 H = hydraulic (automatic) transmission
M = manual transmission
E = electric propulsion
  • This letter was omitted for buses built prior to 1947, except for those with electric propulsion.
 27 = 25 feet (7.6 m)
31 or 32 = 28 feet (8.5 m)
35, 36 or 37 = 30 feet (9.1 m)
40 = 33 feet (10 m)
45 = 35 feet (11 m)
48 = 37 feet 9 inches (11.51 m)
51 = 40 feet (12 m)
54 or 55 = 41 feet 6 inches (12.65 m)
  • Two digits.

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