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Last night watching TV Tokyo's "Cambria Kyuden" program, there was this CM for Tokyo Metro. It's part of their "Metro wa susumu, susumeru" series focusing on infrastructure improvements. It's a stylized depiction of the Tozai Line. Starting at about 0:10 is the section of line between Kudanshita and Iidabashi, where a flat junction causes a bottleneck with turnback operations. The pocket track will be converted to a passing track, allowing through trains to proceed while a turnback train is reversing in an ecs move. At about 0:18 is Minami Sunamachi Station. The current station is quite restricted in space as it was built with caisson method tunneling, and is quite congested with passengers during the rush hours. Another platform will be built, allowing what is called "sougou hacchaku", or near simultaneous arrival and departure, which lessens headways and should clear out the crowds faster at this spot. Tokyo Metro info on infrastructure projects, the above projects on p. 8: http://www.tokyometro.jp/corporate/profile/scheme/pdf/plan_h27_2.pdf To add, a CM from Metro's "Anzen. Anshin. Metro no Me" series focusing on the work of individuals and their departments: https://www.youtube.com/watch?v=6RaFEQObvYc