|Dates of operation||1849–1872|
|Successor||Missouri Pacific Railroad,
St. Louis-San Francisco Railway
|Track gauge||4 ft 8 1⁄2 in (1,435 mm) (standard gauge)|
The Pacific was chartered by Missouri in 1849 to extend "from St. Louis to the western boundary of Missouri and thence to the Pacific Ocean." Due to a cholera epidemic in 1849, which was a citywide disaster, and other delays, groundbreaking did not occur until July 4, 1851.
The railroad purchased its first steam locomotive from a manufacturer in Taunton, Massachusetts; it arrived at St. Louis by river in August 1852. On December 9, 1852, the Pacific Railroad had its inaugural run, traveling from its depot on Fourteenth Street, along the Mill Creek Valley, to Cheltenham in about ten minutes. By the following May, it had reached Kirkwood.; within months tunnels west of Kirkwood were completed, allowing the line to reach Franklin.
By July 1858 the Pacific Railroad reached Tipton, the eastern terminus for the Butterfield Overland Mail, an overland mail service to San Francisco. The combined rail/coach service reduced mail delivery times between St. Louis and San Francisco from about 35 days to less than 25 days.
In 1865, it became the first railroad to serve Kansas City, after construction was interrupted by the American Civil War. In 1872, the Pacific Railroad was reorganized as the Missouri Pacific Railway by new investors after a railroad debt crisis.
See also 
- List of defunct Kansas railroads
- List of defunct Missouri railroads
- Butterfield Overland Mail in California
- Butterfield Overland Mail in New Mexico Territory
- Butterfield Overland Mail in Texas
- Butterfield Overland Mail in Indian Territory
- Butterfield Overland Mail in Arkansas and Missouri
- MPHS - Missouri Pacific Railroad History
- St. Louis Historic Context: Transportation
- Frisco Depots: St. Louis County, Missouri
- "100 Years of Service". 1960. Retrieved 2006-04-20.
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