Tokyo’s future railway lines
Saturday, June 28th, 2008In January 2000, the Ministry of Land, Infrastructure and Transport released a detailed study on how the Tokyo mass transit network could be expanded over the next 15 years. (Japanese text is here.) Many of the ministry’s suggestions have since been fulfilled, including the completion of the Oedo Line, Saitama Rapid Railway, Tsukuba Express, Nippori-Toneri Liner and Fukutoshin Line. But there are still a number of lines which have yet to be finished, and here are the most likely candidates to be built:
- Narita Airport Railway
Under construction – opening in 2010
- Tohoku Line (Re-)Extension
Under construction – opening in 2013
This line actually used to exist but was cut off in 1973 so that the Tohoku Shinkansen could be extended to Tokyo Station over the Tohoku Main Line’s right-of-way. Opening the connection again will allow through service with the Tokaido Line, similar to the existing connection between the Sobu and Yokosuka lines. The main obstacle is (as you might expect) local citizens’ groups, who are calling on JR to “stop the heat island” (whatever that means). Despite their protests, JR started construction earlier this summer and plans to build the line over the next five years (i.e., really really slowly).
- Yurakucho and Hanzomon Line Extensions
Proposed for construction by 2015
A few bedroom towns in Chiba and Ibaragi are lobbying to have these extensions built, but Tokyo Metro cut off its construction budget with the Fukutoshin Line project and is not officially planning to extend any other lines, at least for now. I really hope they get around to this, though, because the Joban Line is inhumanely overcrowded during rush hour, even with 15-car trains.
- Sobu-Keiyo-Keisei Connector
Proposed for construction by 2015
This plan is apparently still on the drawing board, but sounds pretty promising given all the development going on around the Chiba waterfront. It would probably be good for foreign visitors to Disneyland and Tokyo Big Sight as well.
- Asakusa Line spur to Tokyo Station
Proposed for construction by 2015
Most significantly, this would open up a new direct route from Tokyo Station to both Haneda and Narita Airport, potentially putting Keisei and Keikyu in even more direct competition with JR for airport-bound passengers. There is some speculation (e.g. among Wikipedia) that the Tokyo government may build additional passing tracks on the Asakusa Line to allow for high-speed direct trains between Haneda and Narita, which would likely become more necessary as regional international flights are moved from Narita to Haneda.
- Kan-nana and Kan-hachi Lines
Proposed without a deadline
The lines would provide train service to huge under-served portions of suburban Tokyo, but would likely be difficult and expensive to construct because of their length. There is also doubt regarding how this line would compete with the proposed Yurakucho and Hanzomon extensions, which would follow a similar routing in east Tokyo. I would vote in favor of these lines since I now live near the proposed corridor, but we’ll have to wait and see whether any funding comes out to build them.





