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
 * Amtrak California (CDTR), 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

Regional railways

 * Brightline West (BLW), high-speed passenger
 * Central Oregon & Pacific Railroad (CORP), freight and passenger
 * San Joaquin Valley Railroad (SJVR), freight

Shortline and terminal railways

 * Altamont Corridor Express (ACE), passenger on freight lines
 * Arizona & California Railroad (ARZC), freight
 * Arrow Rail (ARRW), passenger
 * California Northern Railroad (CFNR), freight
 * Central California Traction Company (CCT), freight and passenger
 * Coast Express Rail (NCTC), passenger
 * Lake County Railroad (LRY), freight
 * Los Angeles Junction Railway (LAJ), freight
 * McCloud Railway (MCR), freight and passenger
 * Metrolink (SCRA), passenger
 * Modesto & Empire Traction Company (MET), freight
 * Napa Valley Railroad (NVRR), freight and passenger
 * Oakland Terminal Railway (OTR), freight
 * Pacific Harbor Line (PHL), freight
 * Quincy Railroad (QRR), freight
 * Richmond Pacific Railroad (RPRC), freight
 * Sacramento Southern Railroad (SSRR), freight
 * Sacramento Valley Railroad (SAV), freight
 * San Diego & Imperial Valley Railroad (SDIY), freight
 * San Francisco Belt Railroad (SFB), freight
 * Santa Cruz, Big Trees & Pacific Railway (SCBG), freight and passenger
 * Santa Cruz & Monterey Bay Railroad (SCMB), freight and passenger
 * Santa Maria Valley Railroad (SMV), freight
 * Sierra Northern Railway (SERA), freight and passenger
 * Sonoma-Marin Area Rail Transit (SMRT), passenger
 * Stockton Terminal & Eastern Railroad (STE), freight
 * Trona Railway (TRC), freight
 * Tulare Valley Railroad (TVRR), freight
 * Ventura County Railroad (VCY), freight
 * Western Farm System (West Isle Line) (WFS), freight
 * Yreka Western Railroad (YW), 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.