Oh, it was the Crimson Countess adventure [spoilers below for others reading] and it was a blast.
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We unhitched the train cars, tried to lure the monster to the Were-Leopard cages, quickly got attacked by the Were-Leopards, locked ourselves in with the monster, one of us died and the others narrowly escaped. Got onto the train by hiding in boxes, pretending to be a doctor after poisoning the musician, and pretending to be an engineer.