The Missouri Pacific Railroad, also known as the MoPac, was one of the first railroads in the United States west of the Mississippi River. The discovery of gold in California in 1848 ignited the need for more rapid and dependable transportation to the west and leaders in St. Louis, Missouri soon visualized a railroad all the way to the Pacific Ocean. These leaders soon secured a Missouri charter in 1849 for the Pacific Railroad which would extend from St. Louis to California. On July 4, 1851, the ground-breaking ceremony for the Pacific Railroad was held in St. Louis and the first section of the track was completed in 1852. Expansion of the railroad was interrupted by the
Civil War, but afterward was soon resumed and by 1865, it was the first railroad to serve Kansas City.
In 1872, the Pacific Railroad was reorganized as the Missouri Pacific Railroad, due to high debts. The following year, Jay Gould, an extremely controversial New York financier, began to invest in several western railroads, including the Union Pacific, Kansas Pacific, Denver Pacific, and the Central Pacific. Seeing the Missouri Pacific Railroad as a threat, he bought controlling interest in the company in 1879 and became its president. Gould soon developed a system which extending through Colorado, Nebraska, Arkansas, Texas, and Louisiana. By the 1980s MoPac owned almost 11,500 miles of railroad and over 1,500 locomotives, in 11 states from Chicago in the east, Pueblo, Colorado, in the west, Omaha, Nebraska in the north, and south to the Mexican border at Laredo, Texas.
Gould remained in control of the Missouri Pacific until 1915. Two years later the line was merged with the St. Louis, Iron Mountain and Southern Railway (SLIMS) and reorganized. The company later acquired or gained a controlling interest in other lines in Texas, including the Gulf Coast Lines, International-Great Northern Railroad, and the Texas and Pacific Railway.
The railroad thrived through the early 20th Century until railroad traffic, especially passenger service, began to dwindle. In the mid-1960s, the Missouri Pacific aggressively began to discontinue passenger trains. On December 22, 1982, the Missouri Pacific merged with Union Pacific and Western Pacific Railroad companies to create the largest system at that time. The Missouri Pacific, though now a part of the Union Pacific System, maintained its own corporate and commercial identity until January 1, 1997.