Horror Film Opening Plot

Five boys have just finished their A levels and want to go out partying and have a lads weekend together, they are going to be meeting a load of their other mates up there because they missed the train before. The group are heading up to London and planning to go to as many clubs as they can. The boys train leaves at 10:25pm, but this train gets delayed, is this a sign? When the train arrives, it arrives with the lights off, the lights come on after about 5 seconds of the train being stationary, and then the doors don't open for a short amount of time, which also is another sign but the boys choose to ignore these signs, which is the wrong decision...