It seems like the most obvious joke ever now: a training game about trains. Especially in Japan, the land of both trains and training games. And now it's real! We made up the pithy name, though. The real one is not nearly as catchy: Chishiki-Ou Series Train Master.
Train Master features daily quizzes, each day of the week focused on a different category, including routes, trains, train cars, and history. On Friday, you get to choose the topic, and on Saturday, you are tested from within all the topics. This is actually starting to sound like work.
The developers seem to recognize the work-like aspect, as well. On some Sundays you get to take a day off from quizzing-- to go on a virtual date with one of the mascot characters at an interesting railroad- or train-related location.