The Mormons also planned a “swift pony express” to carry the mail between Independence and Salt Lake City in twenty days. Stations existed at Fort Supply, and Fort Bridger, and they hoped to establish additional stations . . . Ultimately, Brigham Young planned to build stations with settlements mills, storehouses, and plant cropland approximately every fifty miles or the equivalent of a day’s travel by a team of horses. . . .
Young’s plans never fully materialized. Service was interrupted during the summer of 1857, when the government suddenly cancelled Kimball’s [mail] contract without explanation, and the so-called “Utah War” with the Mormons began.