A lesser entry in the John Wayne canon, but not without interest. I thought Duke did quite well with the light comedy in the first part of the film before getting tough later on. And he looks as good as he ever did.
I liked the opening scene as the camera panned along the train interior catching the comments of the passengers - including, I'm sure, Guinn "Big Boy" Williams who had a few words to say, though the film doesn't appear in his filmography on this site or in Quinlan.
Albert Dekker is quite a likable villain, and, for the era in which the film was made, it's quite clear what his intentions are towards Martha Scott; the innuendo is strong, and in the hotel she even looks into the room adjoining hers and gasps when she spots the bed where he wants her to end up.
I'm a bit dubious about the total oil capacity of the various wagons at the end of the film and how easily some of the explosions occurred, but the sequence is quite a novel one. And the period - very early 20th century - is an interesting one, with the film making several allusions to the new life-style that will be made possible by oil.
Apparently Rhonda Fleming is in the chorus line in her very first film, and Gabby Hayes isn't too annoying in his customary old coot/sidekick role.