About The Tazawako Line (田沢湖線, Tazawako-sen) is a railway line operated by East Japan Railway Company (JR East) connecting Morioka Station in Morioka, Iwate and Ōmagari Station in Daisen, Akita, Japan. Akita Shinkansen Komachi trains travel over the line, which was regauged in 1997 from 1,067 mm (3 ft 6 in) to 1,435 mm (4 ft 8+1⁄2 in). Line length is 75.6 km (47.0 mi) and there are 18 stations. Stations Rollingstock 701-5000 Series E6 Series Shinkasen
I think there used to be an abridged version of this route in Densha de Go Professional. It was rather good with a choice of driving the fast trains or the 2 car 701’s as noted above. Unfortunately the bottleneck seems to be only UW doing Japanese routes and their current Tadami Line stuck in development limbo, there doesn’t seem much hope of anything else being added to the list unless DTG either undertake the job themselves or find another third party to do it.