

A prospector discovers natural cement and suggests it should be used for a new dam. But this is the last thing the badmen of Trail End want, as they have a monopoly of the wagons needed to haul rocks to the site. A pretty sheriff notwithstanding, it's a job for a singing marshal.
Acting
Gene Autry's horse Champion out-emotes the entire supporting cast.
Score
The title song will haunt your brain for days. Mule train, mule train...
Director
John English
Trivia, insights & behind the scenes
Gene Autry filmed this during his peak 'singing cowboy' era when he was making up to eight pictures a year. The man basically lived on a horse.
The 'singing cowboy' subgenre peaked in the late 1940s-early 1950s as postwar audiences craved escapist, uncomplicated heroism. This film is basically a time capsule of that very specific vibe.