This past weekend my girlfriend and I took a steam locomotive from Aizuwakamatsu to a city on the west coast of Japan called Niigata. There was a google street view created that allows you to see inside the train, so I have embedded it below.
The train we rode on is not a regular train on this line; It is a sort of specialty train. There are a lot of trains like this in Japan. JR East is the company that runs most of the trains in this part of Japan, and it has an English-language website for these special trains.
Riding on the train was a lot of fun. It was very comfortable inside. So comfortable that some people fell asleep quickly.
There were a lot of pretty views out of the train window. Pictured below is the big mountain near Aizu, Mt. Bandai, covered in clouds.