Railway companies of Maryland

List of railway companies in the American state of Maryland.

Class I railways

 * Amtrak (AMTK), passenger on freight lines
 * Chesapeake Southern Railway (CHS), freight
 * New York Western Railroad (NYW), freight
 * Pennsylvania Seaboard Railroad (PS), freight

Shortline and terminal railways

 * Canton Railroad (CTN), freight
 * MARC Train (MARC), passenger on freight lines

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