Railway companies of Illinois

List of railway companies in the American state of Illinois.

Companies based in the United States

 * Amtrak (AMTK), passenger on freight lines
 * Burlington Northern & Gulf Railroad (BNG), freight
 * Chesapeake Southern Railway (CHS), freight
 * Conrail (CR), freight and passenger
 * Kansas City-Santa Fe Railroad (KCSF), freight
 * New York Western Railroad (NYW), freight
 * North Western Pacific Railroad (NWP), freight and passenger
 * Pennsylvania Seaboard Railroad (PS), freight
 * Pere Marquette Railway (PM), freight
 * Union Pacific Railroad (UP), freight

Companies based outside of the United States

 * Canadian National Railway (CN), freight

Regional railways

 * Chicago & Illinois Midland Railway (CIM), freight

Shortline and terminal railways

 * Alton & Southern Railway (ALS), freight

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