The Oigawa Railway is a private electric line that runs a scenic daily steam service on the southern part of its line from Kanaya to Senzu. There is a small musuem at the station at Shin-Kanaya. North of Senzu is the Ikawa Line, worked by diesels and electric rack locomotives, a former logging railway.
JR Tokaido line station Kanaya.
The following locomotives are on display and in use:
C10-8, C11-227, C12-164, C56-44, 1275, Izumo 1, electric locos E101, E102, E103.
In addition there are a shop and cafe at Shin-Kanaya.
Japanese Railway Society report with pictures
Wikipedia web page
Railway website (Japanese)