MARC Penn Line:
Maryland Rail Commuter Service (MARC) is a regional rail system with three lines in the Baltimore-Washington Metropolitan Area. The rail system is administered by the Maryland Transit Administration (MTA) and is operated under contract with CSX Transportation and Amtrak.
MARC's Penn Line, which carried 19,000 riders a day between Washington, DC and Baltimore is operated by Amtrak employees. Its known as the fastest commuter rail line in North America with trains operating at speeds as high as 125mph. With 14 stations, MARC's Penn Line gives rail riders direction connections to Amtrak, Baltimore's Light Rail system, and DC's Metrorail subway.