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I liked the idea, you could even make it an instance with different start/end points. (They say they wanted to make more instanced content was why I suggested making it instanced)
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The train could have all sorts of weird staff too...
Maybe there are some skeleton passengers who might initiate small side quests where you slowly learn more about them and the history of the train.
Also maybe there is a very special train-ticket, having it the train would take you to a small mystical island that is on no map.