The Pony Express came into existence in the 19th Century. It cut delivery of mail time in half for example to California, from 25 days to 10 days. This was accomplished by the establishment of a network of relief stations. The relief stations were spread across Missouri, Kansas, Nebraska, Colorado, Wyoming, Utah, Nevada and California. Riders switched horses every 10 – 15 miles across the relays and switched to a new rider at 75 – 100 miles. The riders weighted typically 100 – 120 lbs and were young men in their early 20,s.
However, the Pony Express was an unprofitable venture and the company only last approximately 1.5 years.