The Pony Express was a mail service delivering messages, newspapers, and mail using relays of horse-mounted riders that operated from April 3, 1860, to October 26, 1861, between Missouri and California in the United States of America.. It was operated by the Central Overland California and Pikes Peak Express Company. When replaced by the telegraph, the Pony Express quickly became romanticized and became part of the lore of the American West. Its reliance on the ability and endurance of hardy riders and fast horses was seen as evidence of rugged American individualism of the frontier time...