President Manson of the O.R. and N.R.R. is advised by the Acting Postmaster General that a test for the mail contract will he held December 17th and that a pouch must he delivered at Stevenson at two o'clock or the contract will be forfeited in favor of the Union Central R.R. The next day at the office of the superintendent of the Union Central word is received that the O. and R. is likely to secure the contract, and Thomas, the vice-president, wires to the superintendent of the Union Central that he must stop at nothing to thwart the competitor. The superintendent of the Central calls in one of his tough section hands, who schemes to disable the engine on which the trial mail pouch is to be carried. The station agent's daughter discovers the plot and taking the mall pouch from the wrecked engine, runs to a nearby locomotive and sets forth to complete the journey. A wild ride takes place but just as the clock is striking two, the plucky substitute arrives at Stevenson and delivers the mail.
—Moving Picture World synopsis