Wyoming was no less exciting as fields gave way to sagebrush, desert, and mountains. If you look carefully, you will find one of the riders using no halter or bit. He used only a leather strap draped around his horse's neck to communicate instructions.
You will also see a three-generation family of Re-Riders (Dad Ron Atkinson, Daughter Kristi Arnell, and Granddaughter Halle Atkinson, who carried the mochila) who descend from an actual Pony Express rider, Major Howard Egan, who had a very illustrious life. https://majorhowardegan.com/short-egan-history/.