sketches of tentative itinerary for first week of rail pass (Oct 25~31)pic.twitter.com/0VHXXteQr7
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The depth is also an issue esp for trains bc railways can't handle steep grades like roads can--so what's possible for a road tunnel may be impractical for a rail tunnel. Lack of urbanization is one factor, but then again, urbanization can be spurred by having a link...
For probably political and historical reasons Shogun 2 wasn't sufficient to teach me, there were no big cities comparable in Chiba. Tokyo was the big city in the area, and with no particular reason to connect east, it focused on expanding west/north into easy plains instead.
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