Brunswick Line

Prior to MARC, the B&O operated commuter trains between Washington and Martinsburg, which continued even after the start of Amtrak on May 1, 1971. Maryland began subsidizing the trains in 1974 and, in 1975, assumed full responsibility for the subsidy and equipment replacement. West Virginia followed suit soon after, guaranteeing service to its stations.[2]

In 1983, Maryland – along with a number of other Northeastern states – took control of its commuter railroads, organizing them under the "MARC" (Maryland Area Regional Commuter) service name.[3] Trains on the Brunswick Line were operated under contract by CSX Transportation, successor to the B&O. Brunswick Line service was augmented in 1986 when Amtrak transferred its Washington–Martinsburg Blue Ridge to MARC after agreeing to subsidize the train for five years.[2]

In May 2010, MARC announced that it planned to find a new operator for the Brunswick and Camden Lines after CSX announced its desire to discontinue operation of commuter trains.[4] MARC selected Bombardier Transportation Services USA Corporation (BTS) (a subsidiary of the Canadian company Bombardier Transportation) to replace CSX, and BTS assumed operations and maintenance of the lines on June 29, 2013. CSX continues to dispatch the lines.[5]

Brunswick Line trains typically have 3–6 single or bilevel passenger cars and one or two diesel locomotives. The trains operate in a push-pull configuration, with the cab car typically facing Washington.

Prior to being replaced by new Bombardier Multilevel II cars, MARC's ex-Metra Pullman Gallery cars were used exclusively on the Brunswick Line, which is the only MARC line with all low-level platforms (except the Frederick Branch, which has a high level platform at Monocacy station).

The Brunswick Line has service only on weekdays,[6] with 9 trains in each direction, and an additional train outbound from Union Station on Fridays. Three of the 9 trains in each direction serve the Frederick branch. Of the remainder, 3 inbound and 3 outbound serve Martinsburg, while the remainder originate or terminate at Brunswick. A bus runs between Frederick and Point of Rocks, meeting trains that do not serve the Frederick Branch.[6]

Martinsburg, Harpers Ferry, Rockville, and Union Station are also served daily by the Amtrak Capitol Limited. Connections to the Washington Metro's Red Line are available at Rockville, Silver Spring, and Union stations.

The Brunswick Line serves the following stations. Not all trains stop at all stations.

State	Town/City	Station	Connections
DC	Washington, D.C.	Union Station	Amtrak: Acela Express, Cardinal, Capitol Limited, Carolinian, Crescent, Northeast Regional, Palmetto, Silver Meteor, Silver Star, Vermonter, Thruway Motorcoach to Charlottesville, Virginia Metrorail: Red Line Metrobus: Loudoun, OmniRide VRE: Manassas Line, Fredericksburg Line MARC: Camden Line, Penn Line MTA Commuter Bus: 903, 922
MD	Silver Spring	Silver Spring	Metrorail: Red Line Metrobus: 70, 79, F4, J1, J2, J4, Q1, Q2, Q4, S2, S4, S9, Y2, Y7, Y8, Z2, Z6, Z8, Z11 Ride On: 1, 2A, 2B, 4, 5, 8, 9, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 28, 127 MTA Commuter Bus: 915, 929
	Kensington	Kensington	Ride On: 4, 5, 33, 34, 37
	Garrett Park	Garrett Park	Ride On: 5, 37, 38
	Rockville	Rockville	Amtrak: Capitol Limited Metrorail: Red Line Metrobus: T2, Q1, Q2, Q4, Q5, Q6, Ride On: 44, 45, 46, 47, 48, 49, 52, 54, 55, 56, 59, 63, 81, 101
	Washington Grove	Washington Grove	Ride On: 61
	Gaithersburg	Gaithersburg	Ride On: 57
		Metropolitan Grove	Ride On: 61
	Germantown	Germantown	Ride On: 61, 75, 83,[7] 97
	Boyds	Boyds[8]
	Barnesville	Barnesville
	Dickerson	Dickerson[8]
	Frederick Branch:
	Frederick	Monocacy	TransIT: 10, 20 MTA Commuter Bus: 204, 505, 515 Meet-the-MARC shuttle
		Frederick	TransIT: 20, 40, 50, 60 MTA Commuter Bus: 515 Meet-the-MARC shuttle
	Brunswick Line:
	Point of Rocks	Point of Rocks	Meet-the-MARC shuttle
	Brunswick	Brunswick
WV	Harpers Ferry	Harpers Ferry	Amtrak: Capitol Limited
	Duffields	Duffields
	Martinsburg	Martinsburg	Amtrak: Capitol Limited