The Tohoku Shinkansen stretch between Tokyo and Sendai would be a great addon for TS20xx. It would be a good addon for TSW2 as well, but it may be too massive for it, so that's why I'm suggesting it for TS20xx. (Yes, it's old, but realistic.) The line length is approx. 350km. There would be a nice variety of services. The rolling stock would be: E2 1000 series The E2 1000 series shinkansen is one of the best looking shinkansen trains in my opinion. The max speed is 275km/h. It's used on Yamabiko services from Tokyo to Sendai and Morioka. E3 series The E3 series shinkansen is used on Tsubasa services from Tokyo to Yamagata and Shinjo. Max speed is 275 km/h. It runs coupled to E2 series operated Yamabiko train between Tokyo and Fukushima. E5/H5 series The E5 and H5 are running on Hayabusa services from Tokyo to Aomori and Hokuto and in future, Sapporo. The max speed is 320km/h. It's the fastest shinkansen train in commercial service along E6 trains. E6 The E6 is used on Komachi services between Tokyo and Akita. Max speed is 320km/h. It runs as coupled with E5/H5 operated Hayabusa service between Tokyo and Morioka.