"Mhn...I haven't been here that long but...Maybe every month or so? I think it has to do with what people ask the train for, actually...one of the newest ones is a 'spa' car with a bath, but another of them was a 'triage' car, since the medical carriage is so far from luggage- which is where people appear if they evacuate on a mission.

"So Triage appeared just after the mission where that was a problem- it's right in front of Luggage."