Tomioka, Gunma - Wikipedia, the free encyclopedia
Gunma Prefecture HomePage
Sorry all could do is to give these links as I have never been to Tomioka myself. The train fare for Tokyo-Tomioka is 5,570 yen for one way and it's about an 80-minute ride (50 mins on Shinkansen and 30 on a local train).
In general, most Japanese don't speak more than a few words of English. And they usually read and write it much better than they speak it.
Hope your stay in Gunma will be enjoyable.