As Thomas leaves Wellsworth, the guard notices Annie's door is not shut properly and as soon as they pull out of the station her door swings open. The quick-thinking guard waves his red flag and stops the train. The Fat Controller praises him and a few days later, the engine crews hold a football match. Thomas wonders why the Wellsworth guard has his flag with him. The Fat Controller tells him that the guard is going to be a linesman and has to wave his flag when the ball goes off the pitch.