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In page Pony Express:

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At the west end of the Pony Express route in California, W.W. Finney purchased 100 head of short-coupled stock called "California horses", while A.B. Miller purchased another 200 native ponies in and around the Great Salt Lake Valley. The horses were ridden quickly between stations, a distance of 10–20 miles (16–32 km). They were then relieved, and a fresh horse was exchanged for the one that just arrived from its strenuous run.[citation needed]