Mt. Akagi halloween train
Running near Mt. Akagi in Gunma Prefecture, this small, rural railway has trains decorated with pumpkins and ghosts from mid-September through October 31st.
Costume contest on a train
On October 25th of this year, the Tokyu Railways' Toyoko Line will have a costume contest inside a train! The train will be well-decorated, of course, and will end in Shibuya Station so the party can continue even after disembarking.
The Randen Line, an above-ground train that runs from the heart of Kyoto city out west to the Arashiyama district, has a yokai, or "monster" themed train! Passengers are encouraged to dress in costume (for a discounted fare!) and the train will act like a very small, two-car haunted house. The only catch: this train runs in August! Scary stories and haunted houses are popular in summer in Japan; the chill that runs down your spine is supposed to help you keep cool during the hot weather.