Baltimore
Intercity rail

Baltimore is a top destination for Amtrak along the Northeast Corridor. Baltimore's Penn Station is one of the busiest in the country. As of 2014, Penn Station was ranked the seventh-busiest rail station in the United States by number of passengers served each year. The building sits on a raised "island" of sorts between two open trenches, one for the Jones Falls Expressway and the other for the tracks of the Northeast Corridor (NEC). The NEC approaches from the south through the two-track, 7,660 feet (2,330 m) Baltimore and Potomac Tunnel, which opened in 1873 and whose 30 mph (50 km/h) limit, sharp curves, and steep grades make it one of the NEC's worst bottlenecks. The NEC's northern approach is the 1873 Union Tunnel, which has one single-track bore and one double-track bore.

Just outside the city, Baltimore/Washington International (BWI) Thurgood Marshall Airport Rail Station is another stop. Amtrak's Acela Express, Palmetto, Carolinian, Silver Star, Silver Meteor, Vermonter, Crescent, and Northeast Regional trains are the scheduled passenger train services that stop in the city. MARC commuter rail service connects the city's two main intercity rail stations, Camden Station and Penn Station, with Washington, D.C.'s Union Station as well as stops in between. The MARC consists of 3 lines; the Brunswick, Camden and Penn. On December 7, 2013, the Penn Line began weekend service.
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