Railroaded

Based on movies like Snowpeircer, Train to Busan, and of course the gaming term from RPGs, Railroaded is a RPG where the players are in the back end of a train and need to get to the front. For this scenario the city you choose to start this in has been overrun by demons. How? Maybe someone broke a seal, read the wrong book or did the darkest of weird mystical ceremonies. Doesn't matter the whatever that started it is back in the city you are trying to get away from. The players are in a train car near the back, but not quite the last one when they start getting cryptic phone calls waning them about animals attacking people in the street, see footage on other people phones and both hear and see military jets flying over the train heading back to the city they just left.Good thing they are safe on the train heading away from all this. Then people start fleeing the rail cars behind them, and they hear the screams coming from somewhere back there. Better get into character, or as they are called in this game, passengers.