Mistaken Orders (1926)

Vincent Barton, the son of the vice-president of a railroad company, takes a job as the depot agent at Bynes. He fires one of Tony Sharkey's henchmen, scheming against the railroad, and, as a result, a fight takes place and a switching order is overlooked which nearly results in a major wreck. Realizing the situation at Hynes, Helen Barton, Vincent's sister, dashes to Hynes in her roadster and puts together a severed telegraph wire to put the station back in communications with headquarters. Meanwhile, Helen's sweetheart, Tom Lawson, is fighting with Sharkey in a run-away engine and it is headed for an open bridge over a river.