Railway companies of California

List of railway companies in the American state of California.

Companies based in the United States

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

Companies based outside of the United States

 * Ferrocarril Baja California (FBC), Mexico, freight and passenger

Shortline and terminal railways

 * Arizona & California Railroad (ARZC), freight

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