SCMAGLEV and Railway Park: Nagoya's New Train Museum
An English audio guide is available for 500 yen, and it's supposed to be really good. There's a lounge area on the second floor, and a small area sells boxed lunches and sandwiches like you'd get on the trains.
The museum is open 10:00-17:30, closed on Tuesdays and over the New Years holidays. Adult admission is 1000 yen, with train simulator fees ranging from 100 to 500 yen.
Access is via Kinjofuto Station, the last station on the Aonami Line, 24 minutes from Nagoya Station (350 yen). Signage at Nagoya Station for the Aonami Line is pretty good, and the railway park is right next to the station.