Want to visit Kurobe Gorge via railway

I will be traveling from Niigata to Unezukionsen. Where do I ride the railway and how do I get back? How long dies this train take?

It is called Unazuki Onsen.

You can look up train timetables here:
http://www.hyperdia.com/

Separately, you can see the timetable of the Kurobe Gorge Railway here:
http://www.kurotetu.co.jp/en/fare/index.html

thank you very much. Checked websites offered and very helpful. Will use on trip in November