Phantom Stagecoach, The (1957, U.S.A.)

A stagecoach firm reels over the news of the third holdup attempt in two months, the last of which resulted in the murder of one of their best drivers. The man who prevented the most recent robbery, is hired by the firm to drive for them while investigating the murder. What he doesn’t know is that a rival firm is responsible for the holdups, and that they have created an armoured, driverless stagecoach to rob future deliveries and take all of the business in town for themselves.