Usually stephen mcnally plays the surly bad guy so playing an undercover good guy is a twist but his attitude hasn't changed ... he's still a hard case and considers himself a lady's man ... and to prove it they have alexis smith play his gal pal ... the usual cast of bad guys are in this film, except jim arness who later becomes matt dillon on the long running series "gunsmoke" ... the problem with this plot is the railroads shipped money for express agents, hardly ever the us postal service .... howard silva never changes his spots