The taunting empty car on the Worcester line

Imagine if your train shows up completely jammed because all the cars are single-level instead of the double-deckers you're used to. Except the last car. It's completely empty. Guess which one you'd try to get on?

There was plenty of room, and as a crowd of us attempted to climb on board, the train suddenly started moving out of the station, with no warning. There was no conductor monitoring any of this. Luckily no one was hurt. ...