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When Helen learns that wiretappers have make a prisoner of Henry, the relief operator, she severs the wire being tapped, boards a freight train, uncouples the engine, and pursues the tappers, who are in a gasoline speeder. She eventually rescues Henry and captures Noyes, the head of the gang, who is then placed under arrest.
as Helen
as Thomas - the Chief of the Gang
as The Chief's Lieutenant
as Henry