Gene Roddenberry's story credit probably comes from his writing the episode of The Virginian (1962) that this show is adapted from. Roy Huggins produced both shows and (especially during the first season of "ASJ" when the scripts were written in a frantic midseason rush) grabbed stories from his earlier series and handed them off to teleplay writers (he almost always heavily revised the draft scripts).
When executive producer Roy Huggins was producing Alias Smith and Jones eight years later, he was faced with a need for an extra script on a very tight schedule and decided to cut this story down to a 60-minute format and use it as "The Girl in Boxcar #3". The transition was not entirely successful, because the motivations of some of the characters were left unclear or became somewhat unbelievable. --anonymous