Maryland railroads

The National Railroad Passenger Corporation, doing business as Amtrak (; ), is the national passenger railroad company of the United States. It operates intercity rail service in every contiguous U.S. state except for Wyoming and South Dakota as well as in three Canadian provinces. Amtrak is a portmanteau of the words America and track.

railway system in the United States of America

American Class I railway (1990–)

commuter rail system comprising three lines in the Baltimore–Washington metropolitan area

MARC commuter rail line between Washington, D.C. and Baltimore, Maryland