Limited Express "Azusa" of Chuo line is a memorable train to me.
It travels from Tokyo to the mountain region of Nagano which is a nice holiday destination with beautiful nature.
I like classical JNR series 183 (189) in particular, because it is the train which I rode for the first time to go to Matsumoto when I was a young student.
The cars were abolished long ago, but I heard from a friend of my son that one of them is preserved and used as a guesthouse. It is named "Yume (Dream) house Azusa" and I once went there with my family. The car is stored in a house and the guest can enter the drivers cab, operate the automatic door and make a train announcement.