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Dolly is a telegraph operator; and Jerry, the engineer, is her sweetheart. He always stops at her station on his return to greet her. She has a little dog, of which she is very fond. One day Jerry tells her that on the next trip he is going to bring the pay-roll. Black Mike, the villain, who has a gang of train robbers, overhears him, and determines to get the money. When Jerry is gone, he enters the telegraph office with his gang and, overpowering Dolly, he cuts the wires. Then he leaves her bound. But her dog comes to her rescue, and gnaws her bonds in two. Dolly, realizing that the wires are cut, knows that she must find some other way of warning the train that the robbery will be attempted. She sets out on a handcar to meet the train at the bridge. Mike and his men are on the trestle, preparing to saw the timbers through, so that the train will be wrecked. But Dolly reaches the train at the junction, stops it and gets into the cab with Jerry. Jerry and his fireman, warned in time, fire at the crooks, and to escape their fire, the gang runs away over the trestle, and, falling through, are buried under the broken timbers. The passengers cheer the lovers as the picture ends.
—Moving Picture World synopsis