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Murphy is the bad guy, but he's a good bad guy, and he plays that kind of role really well. Stewart is the good guy and I like his characterization, too. The connection to ASJ wasn't the actors but rather the setting--part of it takes place in a town called...Junction City! And in the beginning of the film, just after the opening credits, a man dances a jig--a real jig, not like the one Kid Curry attempted in Going, Going, Gone.
This was a Universal picture and I have a sneaking suspicion that Roy Huggins was familiar with it. I really wonder how much he was influenced by these movie Westerns when he worked on ASJ.
As for the plot of Night Passage, it involves Stewart trying to guard a mining payroll being transported by railroad and Murphy trying to rob the train it's on. It's a fast-moving, short movie with lots of action and also good dialog.