Railway companies of Colorado

List of railway companies in the American state of Colorado.

Class I railways

 * Amtrak (AMTK), passenger on freight lines
 * Burlington Northern & Gulf Railroad (BNG), freight
 * Kansas City-Santa Fe Railroad (KCSF), freight
 * New York Western Railroad (NYW), freight
 * Union Pacific Railroad (UP), freight

Defunct railways
Years shown here refer to the period in which a given company operated in Colorado; they may have existed elsewhere before or after these years.