ABSTRACT
Tokyo Metro Co., Ltd. (Tokyo Metro) operates a subway network with nine lines over a total distance of 195.9km in the Tokyo Metropolitan area, the world’s most massively urbanized area. The subway network provides services for 6.44 million passengers a day. Subway’s infrastructure development, and operation and management are undertaken by the same entity, that is, train operations and facilities management are integrated. This paper describes the maintenance of tunnels, including the Ginza Line, in which the Ueno - Asakusa section was opened for service in 1927 (the whole line opened in 1939).
