When Conductor 786 is fired because a woman, through her own carelessness, has fallen off the car, Jack, the superintendent's son, who has witnessed the accident, persuades his father to reinstate the old man. A little later Jack fails in an attempt to elope with Mary, and appeals to Conductor 786 in his trouble. The grateful conductor borrows for him the high powered line auto. Together they succeed in getting Mary away from the house on the top of the auto. But her father is roused, and he and his chauffeur give chase. The young couple have no time to stop at the parson's, so they drive up to his window and he boards the auto. Discovering that a female witness is necessary they seize a woman at a window getting the night air, and place her also on the auto top. Then, traveling at the rate of sixty miles an hour, Jack and his sweetheart are married. The ceremony over, father is permitted to catch up. Conductor 786 effects the reconciliation of the superintendent with the runaway pair.
—Moving Picture World synopsis