Diamond Jim: Skulduggery in Samantha (1965)

Adventurer Diamond Jim Brady is hired by Enwright, a railroad company president, to ramrod his track through to a silver boomtown in Colorado by the required date. If Brady succeeds the company will earn a $250,000 payment; if he fails the railroad will go bankrupt. Fighting Brady and his men are a ruthless gang of outlaws employed by a rival line to make sure that the track doesn't make it to town on time.