It’s 1860 and a young courier hops atop the fastest horse available and sets out across an arid landscape of prairie grass and sagebrush with his letters stowed safety in a leather saddle pouch called a “mochila.”

He rides a certain distance to a relay station, where another young rider waits. The mochila is transferred to the new rider and he continues the journey across the Pony Express, between St. Joseph, Mo., and Sacramento, Calif.

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