This is the story of the wild and roaming career of a ramshackle old railroad car which has been given Roy and his companions for a troop meeting place. The boys, who have spent a hard day cleaning and repairing the car, fall asleep in it. In the darkness of the night, and by a singular error of the railroad people, the car is "taken up" by a freight train and instead of being left at a designated point several miles below, is carried westward, so that when the boys awake in the morning they find themselves in a country altogether strange and new. The story tells of the many and exciting adventures in this car as it journeys from place to place.