The Virginian Season 6 Episode 6 The Masquerade

George Foster a bank clerk receives a letter indicating his father will be stopping by for a two hour visit while on a train trip. George's father was a renown sheriff in Iowa and George has lead him to believe George is Sheriff of Medicine Bow. Deputy Ryker decides the town can put on a masquerade for two hours that George is sheriff. However, when the train is delayed in Medicine Bow for 2-3 days due to a derailment, Ryker's plan requires significant enhancement.