The Camden Line is a MARC commuter rail line that runs for 39 mi (63 km) between Washington Union Station in Washington, D.C., and Camden Station in Baltimore, Maryland, over the CSX Capital Subdivision and Baltimore Terminal Subdivision. The Baltimore and Ohio Railroad began running commuter service from Baltimore to Ellicott City over part of the current line's trackage on May 24, 1830, making this corridor one of the country's oldest rail routes still in operation. The line was extended to Washington on August 25, 1835. The Camden Line is the shortest MARC line. As of 2019, the Camden Line is a weekday-only service.

State	Town/City	Station	Connections
DC	Washington, D.C.	Union Station	Amtrak: Acela, Cardinal, Carolinian, Crescent, Floridian, Northeast Regional, Palmetto, Silver Meteor, Vermonter, Amtrak Thruway to Charlottesville, Virginia MARC: Penn Line, Brunswick Line VRE: Manassas Line, Fredericksburg Line Metrorail: Red Line Metrobus: 80, 96, 97, D6, D8, X1, X2, X8, X9 DC Circulator: Georgetown, Navy Yard DC Streetcar: H Street/Benning Road Line MTA Maryland: 903 Loudoun County Transit: Loudoun County PRTC: Lake Ridge OmniRide Intercity bus service: Greyhound, Peter Pan, Megabus, Washington Deluxe, BestBus
MD	Riverdale Park	Riverdale	Metrobus: F4
	College Park	College Park	Metrorail: Green Line Metrobus: 83, 83X, 86, C8, F6, J4, R12 University of Maryland, College Park: Shuttle-UM 104, 109 Prince George's County TheBus: 14, 17 MTA Commuter Bus: 204
	Greenbelt	Greenbelt	Metrorail: Green Line Metrobus: 87, 89, 89M, B30, C2, G12, G14, R12 University of Maryland, College Park: Shuttle-UM 129 Prince George's County TheBus: 11, 15X, 16 RTA: 302
	Beltsville	Muirkirk	RTA: 302
	Laurel	Laurel	Metrobus: 87, 89M RTA: 409
		Laurel Race Track
	Savage	Savage	RTA: 409
	Jessup	Jessup
	Dorsey	Dorsey	RTA: 501
	St. Denis	St. Denis
	Baltimore	Camden Station	Baltimore Light RailLink

• MARC Camden Line official information page
• Baltimore and Ohio Old Main Line and Washington Branch Photo Tours (TrainWeb)