MARC (Maryland Area Rail Commuter) is a commuter rail system in the Washington–Baltimore area. MARC (reporting mark MARC) is administered by the Maryland Transit Administration (MTA) and operated under contract by Alstom and Amtrak on track owned by CSX Transportation (CSXT) and Amtrak. In 2023, the system had a ridership of 3,860,600, or about 12,400 per weekday as of the fourth quarter of 2023, ... Wikipedia