The Keiyo Line begins deep under Tokyo Station, then hugs the coastline to Soga before branching to either Kimitsu or Katsuurapic.twitter.com/UY5pt1bn9L
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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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