Climbing into a cab of a freight engine, Bobbie Layson, the son of a station pulls the throttle open. The alarm goes out and Helen, stationed at Lone Point, is ordered to derail the runaway and thus prevent it from running head-on into the approaching passenger train. Fearing for his son's life, Layson phones Helen

Helen Gibson
as Helen

Franklyn Hall
as Odell - Engineer

Clarence Burton
as Layson - Station Agent

Clement Graw
as Pinture - Fireman

Tom Trent
as Bobbie Layson - the Boy at the Throttle