Why Tokyo's Busiest Stations Are All on One Loop
Private railways were banned from crossing the Yamanote loop. They terminated at its stations, and the stations became cities.
Tokyo's Yamanote Line is a 35-kilometre rail loop that closes around the heart of the city. It became a circle on November 1, 1925, when JR's predecessor finally laid track between Kanda and Ueno and joined the two ends together. What the Ministry of Railways did next is the part most riders don't know.
In the prewar era, the ministry refused to let private suburban railways cross the loop. If you ran a commuter line from the western suburbs into Tokyo, you got to the Yamanote and stopped. You could not bore through to Ginza or Hibiya or any of the central wards inside the ring. The instruction was administrative, not engineering: there were simply no permits.
That single rule is why Shinjuku, Shibuya, and Ikebukuro look the way they do. Each of them is a place where a private railway hit the wall, gave up on the city centre, and built a terminal. The Odakyu line dead-ends at Shinjuku. The Tokyu Toyoko line dead-ends at Shibuya. The Seibu and Tobu lines dead-end at Ikebukuro. Each terminus filled with department stores, food halls, hotels, and offices owned, often, by the railway company itself, which had to make money off arriving passengers because it could not carry them further.
Shinjuku Station now moves more than three million people a day, which has made it, by ridership, the busiest railway station in the world. Ikebukuro is second. The Yamanote loop is still there, still circling, still the line you transfer to. The wall the ministry put up a century ago is invisible now, but every Tokyo skyline photo with the high-rises bunched into three or four clusters is a picture of it.
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