The Iron Horse - Season 2 Episode 16
The Prisoners

A dying marshal deputizes Dave (who in turn also deputizes Calhoun) to transport his prisoner to Doans Junction to be tried for murder. But other members of the killers gang have boarded the train and are planning to break him free. The prisoner also sees an opportunity for escape in a young woman who is being forced into marrying a wealthy man and clearly doesnt want to.