In the second entry of the popular Hazards of Helen series, Helen, is temporarily assigned as a telegraph operator at Quarry Depot; bad blood springs up between two men who are seeking Helen's favor, but to whom she has remained impartial.
Helen, the telegrapher at Downing Junction, receives word that an engineer has been accidentally shot by a partridge hunter, and the runaway train will collide with the Eastbound Express. Helen jumps onto a nearby standing locomotive, opens it up full throttle, catches up the Express, warns the engineer of the impending danger
King attempts to tighten the brake of a freight car standing near the summit of a steep grade at Lone Point. Suddenly, the brake chain snaps and the train commences to roll down hill. Helen sees King's peril, rides to a point just before a curve, crawls hand over hand across a rope which she has stretched across the track, and snatches King from the car moments before the car is dashed to pieces as it leaves the rails of the curve.
A wagon load of powder explodes, destroying the railroad trestle under which it is passing; Helen, knowing that a passenger train is due within a few minutes, climbs aboard a freight car which coasts down a steep grade near the trestle. As it nears the structure, she applies the brakes, leaps to the ground, crawls across the burning trestle
Sharky, a rival road agent, plots to spoil a trial run to be made on Helen's road that will win a mail contract. He opens a waste valve on the tank of the engine, and, when nearing Lone Point, the water tank runs dry. Helen comes to the rescue by mounting the new gasoline speeder and starting off with the mail for the end of the run.
Jim, determined to ruin a box car brake test, hides inside, removes the flooring, and ruins the brake apparatus. As a result, the box car runs wild, trapping him inside. Before Helen can sidetrack the runaway, it shoots off the track at Elbow curve, overturning as it topples down the embankment. Helen smashes a hole through the side, braves the flames, crawls into the car, rescues Jim and drags him to safety. But her heroism is too late; Jim dies in her arms.
Deering and his gang rifle the station safe and gain possession of some valuable gems; Helen seizes the package and throws it into the river. In order to recover the package, a human chain is formed by the railroad men, which Helen climbs down and attempts to catch the package with her feet. Meanwhile, Deering and his men have boarded a launch, and succeed in grabbing both Helen and the package. Morton takes over a freight train, captures the crooks, and rescues Helen and the gems.
Under the influence of liquor, Griffin foolishly displays a roll of bills. Wheeler and Walter, yeggmen, see the money and trail the traveler to the station. The men learn the berth he is to occupy. Hastening to a bridge under which the train must pass, they drop to the roof of one of the cars when it appears. Helen, transferred to Burnett, is a passenger on the train. By mistake, Griffin gets into her berth. Because of the man's condition, Helen consents to allow him to keep her berth. The girl takes the one which Griffin's ticket calls for. An hour later, Helen is awakened by a peculiar noise outside the car. Hastily dressing, she sees the window being raised. Wheeler's face appears at the window. The man foils Helen's attempt to shoot him, disarms her and then climbs back to the roof of the car.
The bad blood existing between Reardon and Haley results in a fight in which Reardon is worsted. Reardon, vowing vengeance, climbs back aboard his engine while Haley resumes his station. The fight is witnessed by a number of railroad men. In climbing back to the water tank, Haley stumbles and falls between the cars.
Lockwood, the old, one-armed flagman at Lone Point, tells Helen and a young soldier of his experiences during the Civil War, and how he lost his arm. The Civil War flashback sequences consist of archive footage from Kalem's Railroad Raiders of '62 (1911), rather than newly filmed footage.
Brandt, a defaulting cashier, hiding in Lone Point in his effort to throw detectives off his track, cuts the wires of Helen's telephone to prevent her from calling for help, binds and gags her, and boards the outgoing Limited. Freed by Detective Sheridan, the two of them get into a gasoline speeder standing on the sidetrack and pursue the Limited.
Attempting to prevent an armed robbery in the paymaster's office, Helen is bound and gagged, and the thieves escape on a hand car. With her feet still bound by wire, Helen endeavors to pursue on foot, but stumbles and falls across the rails of the track of an oncoming train.
An action movie serial that premiered in 1924
While Hastings, the engineer of Freight No. 3205 is at lunch- in the Lone Point station, Bobby Heywood, the son of an engineer, climbs into the cab of the engine. Having frequently observed his father start his locomotive, Bobby jerks the throttle open. Helen sees the freight speeding down the track. Remembering that Bobby has been playing about the station, the girl surmises what has occurred.
Brent, the night operator has been knocked unconscious by a piece of lumber projecting from a passing freight, and has been rendered temporarily insane. Meantime, a furious storm arises, a track walker discovers a washout and wires a warning to Helen, who sets the danger signal for the Limited which is due in ten minutes.
When informed by Helen that the rival railroad proposes to cross the Salt Lake's tracks, McKay, Division Superintendent, rushes a guard of men to Lone Point. This temporarily blocks the rival road's plan, but only until its force of men has been strengthened.
Their demand for money having gone unheeded, Garibaldi and his gang wreck Number One. Howard, who attempts to interfere, is battered into insensibility. The criminals then place a note in the man's pocket warning the railroad officials to heed their demands in the future.
Upon learning that a gang of smugglers are using freight cars to bring Chinamen across the border, the railroad officials order all employees to keep a strict watch for traffic of this nature.
The new superintendent's first order on taking the post eliminates the men whom he terms old, which costs "Pop" Bates his job as Helen's relief operator. His next declaration is that active railroad work is no place for women, and Helen is also dropped from the service. While Helen is breaking the news to Bob Bates, the new superintendent is hustling about the road yard speeding up the work. "Put more snap into your switching," he tells the men. A minute later, while he is making an inspection inside a boxcar with defective air brakes, a switching engine rams the car. The force of the impact, heightened by the recent orders, throws the superintendent to the floor stunned, and starts the car on the down grade. In the few moments it is speeding along the road and there is consternation among the men for a washout down the road means that it is headed to certain destruction.
To prevent a three mile journey around the mountain the telegraph wires at the construction camp have been strung over the precipice from the station on the mountain top. The operator is discharged when the superintendent suspects him of treachery and Helen is transferred to the station. Later, after the former operator has enlisted the aid of crooked brokers to use his knowledge in ruining the value of the road's stock, he receives an opportunity to get revenge on the superintendent.