The time period for this film is actually pretty common for a Randolph Scott western--and about the fourth or fifth one set just after the Civil War. Like most of the films, Randolph fought for the South and now that the war is over, he has a choice to either accept the outcome or be a whiny jerk about it. Well, he's a smart guy and soon gets a job working for the Santa Fe railroad, but his three brothers who served with him aren't so bright--they hate the North so much that they do what they can to wreck things--even though there is no reasonable reason for this. So, much of the film pits Scott against his own kin (and vice-versa) as he tries hard to get the railroad completed and they work to undo it as much as possible--working for a traveling saloon whose task, it seems, is to both make money off the workers AND get them distracted from their job.
In addition to his brothers, Scott deals with a wide variety of things that might impede the progress of the railroad--rival companies, local Indian tribes and the like. This makes Scott's job in the film as a sort of trouble-shooter. How true all these problems were in the construction of the rails is beyond me and I assume that the writers took a few liberties...just a few! Overall, the film is pretty good. While it isn't among Scott's best films (they were made later in the decade and the early 60s), this is a good film from this time period.