The idea here of having a bratty rich teen forced , by circumstances, to learn to take part in a cattle drive was later extended in "The Cowboys" to include a cattle drive in which all the wranglers were young teen or pre-teen novices, led by John Wayne and his cook. That's actually a more interesting film than this one. Both have an obligatory cattle stampede.
Dean Stockton, as Chester, is unbelievably rude and demanding, while riding in a separate car from his father, who owns the railroad. The train stops to take on water in a very rocky desolate landscape. Meanwhile, Chester wanders off, chasing a lizard, being tardy getting back to the train, which unknowingly leaves without him. Instead of waiting around the water tower for another train, he wanders off into the rugged landscape. Eventually, he runs into Joel McCrea(Dan), chasing a fast mustang, which Dan has named "Midnight". It took a while for the 2 to get acquainted and agree on what to do about the boy's situation. At first, Chester wanted to get back to his train the quickest way. But that didn't look feasible, so it was agreed that he would be taught some of the skills of being a trail wrangler. It much helped that he had considerable experience riding horses in the East. However, he had to adapt to western-style saddles and riding methods. He showed his spunk in riding a particularly wild bucking bronco.
Talkative Chill Wills is a treat as the chuck wagon master, whom Chester helps a bit... Dan notes that cattle are usually more restless at night when they are thirsty, being more easily spooked into a stampede.
Unusually, there are no featured women. Also, there are no rustlers nor Indians to add drama. Besides Chester's challenges, the main drama comes from chasing and dealing with Midnight, and the cattle stampede, which is quite well done.