"Alfred Hitchcock Presents" Don't Interrupt (1958)

Radio warns of a mental patient escaped from a hospital into a severe New Mexico blizzard. At the rail-stop near the sanitarium, a huge, old cowboy boards the train & calms a rattled family with tall tales of the West, as the besieged train grinds to a halt. Totally entranced is the family's young boy, dressed as a gunslinger. Is the patient the old cowpoke?