The Saikyo Line runs from Osaki to Kawagoe, paralleling the western part of the Yamanote Line. Thru service under Tokyo Bay to Shin-Kibapic.twitter.com/QYjlvGJoYq
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These lines wrap around downtown Tokyo, connecting far-flung satellite cities as shown by this map...pic.twitter.com/jcWgDtadpE
Until the Ueno-Tokyo viaduct was built, the Tokaido Line terminated at Tokyo, and the Utsunomiya/Takasaki Line at Ueno...
...so that only the Shonan-Shinjuku Line could offer thru service. Fortunately, this is no longer the case!
This has not been an exhaustive listing--other lines in the area include the Ome Line, Itsukaishi Line, Sagami Line, Tsurumi Line...
...and many more, all operated by JR East. However, I wanted to focus today's thread on the most important lines.
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