Kyoto Railway Museum
One of Japan's largest railway museums, near Kyoto Station, with over 50 real locomotives and train cars, including a steam locomotive roundhouse still in occasional operation, plus a running steam train ride and detailed model layouts.
Open 10:00–17:00, last entry 16:30; closed Wednesdays (with holiday exceptions) and around New Year. Adult admission is around ¥1,500. It's a short walk or shuttle bus from Kyoto Station and popular with families, so weekends and school holidays get busy.