Historic Bus Fleet #1921, Serial# TDH-4509-048 *
The 1900 series of GMC ‘old looks’ were ordered by AC Transit’s predecessor, Key System Transit Lines in 1948, and was transferred to AC Transit in 1960. Coach #1921 was restored to original Key System “fruit salad” colors in celebration of AC Transit’s 20th anniversary in October 1980, and underwent a more extensive overhaul and restoration in 1995.
| Engine | 6-71 Detroit Diesel (inline six-cylinder engine) |
| Transmission | Allison VH-1 |
| Width | 96 inches |
| Length | 35 feet |
| Wheel base | 238.75 inches |
| Seating | 45 seated |
| Wheels | Steel |
*T = Transit model
D = Diesel engine
H = Hydromatic (auto) transmision