>>1645940>>1645983In fact, I think a more likely approacg could be build a Linear Shinkansen from Osaka to Hakata through Shikoku, in order to increase Shinkansen's ridership share on the Tokyo-Fukuoka route, while also providing high speed train to Shikoku cities. But that would mean bypassing Hiroshima, Okayama, and Yamaguchi, especially Yamaguchi which have many high ranked politicians in Japanese political history, that I don't think it's a likely option
And I am not sure whether a Maglev Line at Shikoku can gather enough ridership as to repay the construction cost
In another topic, I think that due to the excess depth along the Hoyo strait, as well as the deposit of explosive near the seabed of that area, (even the route identified by Oita government avoiding deeper area still involve a maximum deoth of 180m below sea surface), maybe routing via Suo Oshima could be a better option?