GMC TD 3610 Transit Bus - Walthers Exclusive Boston MTA Walthers Part # 221-32304, p. 690 Walthers 2011 HO Scale Reference HO scale GM"s "old-look" bus was a familiar sight in many American cities from the 40s onward. Designed especially for city and suburban routes, they came in many sizes with a variety of engine and transmission options, identified by an alphanumeric code. This model is based on the TD 3610, built from 1946-48. Measuring 30" long, "T" indicated a transit bus for city and suburban routes, engines were "D" for diesel or "G" for gasoline, transmissions were "M" (manual) or "H" (hydraulic/automatic), 36 indicated seating capacity and 10 was the model number. Each model features detailed metal and plastic parts, accurate interior and chassis plus authentic paint and graphics.