Railway companies of Massachusetts

List of railway companies in the American state of Massachusetts.

Companies based in the United States

 * Amtrak (AMTK), passenger on freight lines
 * Conrail (CR), freight and passenger
 * New York Western Railroad (NYW), freight

Companies based outside of the United States

 * Canadian National Railway (CN), freight

Shortline and terminal railways

 * Connecticut Southern Railroad (CSO), freight
 * New Hampshire Northcoast Corporation (NHN), freight
 * North Brookfield Railroad (NBFR), freight

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