The Cimarron Kid.

Audie Murphy comes into his own as a Western star in this story. Wrongly accused by crooked railroad officials of aiding a train heist by his old friends the Daltons, he joins their gang and becomes an active participant in other robberies. Betrayed by a fellow gang member, Murphy becomes a fugitive in the end. Seeking refuge at the ranch of a reformed gang member, he hopes to flee with the man's daughter to South America, but he's captured in the end and led off to jail. The girl promises to wait.