Dynamite Pass

At the beginning of the 20th century, a newspaper organizes an endurance horse race : 700 miles to run in a few days. 9 adventurers are competing, among them a woman, Miss Jones, a Mexican, an Englishman, a young cow-boy, an old one and two friends, Sam Clayton and Luke Matthews. All those individualists will learn to respect each other.

At a Mexican ranch, fugitive O'Malley and pursuing Sheriff Stribling agree to help rancher Breckenridge drive his herd into Texas where Stribling could legally arrest O'Malley, but Breckenridge's wife complicates things.

When hired killer John Gant rides into Lordsburg, the town's folk become paranoid as each leading citizen has enemies capable of using the services of a professional killer for personal revenge.

One of the last bills signed by President Lincoln authorizes pushing the Union Pacific Railroad across the wilderness to California. But financial opportunist Asa Barrows hopes to profit from obstructing it. Chief troubleshooter Jeff Butler has his hands full fighting Barrows' agent, gambler Sid Campeau; Campeau's partner Dick Allen is Jeff's war buddy and rival suitor for engineer's daughter Molly Monahan. Who will survive the effort to push the railroad through at any cost?