The 2100 series of GMC ‘old looks’ were ordered by AC Transit’s predecessor, Key System Transit Lines in 1958 to replace the trains then in service on the SF Bay Bridge. This fleet of twenty-one buses were the last of this model built by GMC. When AC Transit took over in October of 1960, the 2100s continued to serve on the bridge until the delivery of the new 100 series GMC ‘fishbowls’. As the fleet aged, they were transferred to local routes and ‘trippers’, finally being used in Fremont and on BART bus routes. Coach #2103 was loaned to Santa Clara County Transit in 1979 for use as a training coach, and was retired in early 1980 when returned to AC Transit. This bus 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.

T = Transit model
D = Diesel engine
H = Hydromatic (auto) transmission