東京市
When Tokyo Shiden (Tokyo City Streetcar, the current Tokyo Toden) lines were damaged by the Great Kantō earthquake in 1923, Tokyo City Electricity Bureau started 2 bus routes, originally as an emergency measure. They became the origin of Tokyo City Bus. In 1942, Tokyo City bought over 8 rivaling bus companies, including of , of , and others. In 1943, TCEB changed to the Tokyo Metropolitan Bureau of Transportation, as the city changed to the metropolis.