Tokyo Metro and Tobu Railway have reached a basic agreement to implement mutual through service via the Hanzomon Line with the Tokyo Skytree Line, Isesaki Line, and Nikko Line, in line with the opening of the Yurakucho Line extension.
The extension between Toyosu and Sumiyoshi Stations on the Yurakucho Line is scheduled to open in the mid-2030s. The through service will improve access to eastern Tokyo and Saitama via Oshiage.
Train formations will consist of 10 cars, with the through service sections and operation plans to be considered moving forward. Travel time will be reduced by about 8 minutes to approximately 53 minutes between Toyosu and Kasukabe Station, and reduced by about 11 minutes to approximately 29 minutes between Soka and Toyocho Station. This is expected to alleviate congestion on the Hibiya Line by about 7% and the Chiyoda Line by about 3%.
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