Bandits attack a train, but Luke chases them off. This luxurious train belongs to the Commodore, richest man in the USA, on a honeymoon voyage to the West with his young bride Tallulah. In recompense, Luke is invited on board as a guest. A relief for Jolly Jumper, whose hooves are worn out! The Commodore, a dyed in the wool businessman, can't resist buying station after station to extend his railway empire right to San Francisco. Meanwhile, Luke has to cope with regular sabotage from a mysterious figure called Black Rider. Our hero is determined to discover his true identity…