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In page Pony Express:

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During his route of 80 to 100 miles (130 to 160 km), a Pony Express rider would change horses 8 to 10 times. The horses were ridden at a fast canter of around 10 to 15 miles per hour (16 to 24 km/h) and at times they were driven to full gallop at speeds up to 25 miles per hour (40 km/h). Horses of the Pony Express were purchased in Missouri, Iowa, California, and some western U.S. territories.[citation needed]