While Hastings, the engineer of Freight No. 3205 is at lunch- in the Lone Point station, Bobby Heywood, the son of an engineer, climbs into the cab of the engine. Having frequently observed his father start his locomotive, Bobby jerks the throttle open. Helen sees the freight speeding down the track. Remembering that Bobby has been playing about the station, the girl surmises what has occurred. Getting aboard a gasoline velocipede standing nearby, Helen dashes in pursuit of the train. The girl realizes that unless the runaway can be overhauled before it reaches the Hobart sidetrack, the freight will crash into the Edmont Local, traveling toward the former on the same track. Bobby's father is the engineer of the local. Helen overtakes the runaway. She leaps aboard the caboose from the velocipede and, climbing to the roof of the car, makes her way forward to the engine, where little Bobby sits terror-stricken. The brave girl averts a frightful wreck in the nick of time.