Mikasa Tetsudo Mura, is situated in Mikasa, Hokkaido, and honours that island's first line
the Horonai Railway.
It has a history museum with models and a small roundhouse.
2-287 Horonai-cho, Mikasa, Hokkaido.
Plus units, carriages, wagons, snow ploughs.
Daily, but not normal Mondays, from mid-April to mid-October. Admission (2018) 530 yen - train rides extra.
Photo of DD51 on Wikipedia
Local tourism website
Museum Website (Japanese)