Baltimore Penn Station, formally named Baltimore Pennsylvania Station in full, is the main inter-city passenger rail hub in Baltimore, Maryland. Designed by New York architect Kenneth MacKenzie Murchison (1872–1938), it was constructed in 1911 in the Beaux-Arts style of architecture for the Pennsylvania Railroad. It is located at 1515 N. Charles Street, about a mile and a half north of downtown and the Inner Harbor, between the Mount Vernon neighborhood to the south, and Station North to the north. Originally called Union Station because it served the Pennsylvania Railroad and Western Maryland Railway, it was renamed to match other Pennsylvania Stations in 1928. The building sits on a raised "island" of sorts between two open trenches, one for the Jones Falls Expressway and the other the tracks of the Northeast Corridor (NEC). The NEC approaches from the south through the two-track, 7,660-foot Baltimore and Potomac Tunnel, which opened in 1873 and whose 30 mph 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. Penn Station is the eighth-busiest Amtrak rail station in the United States by number of passengers served each year. Services The station is the northern terminus of the Baltimore Light RailLink's Penn–Camden shuttle, connecting the Mount Vernon neighborhood with downtown; the southern terminus is Baltimore's Camden Station. It is also a major station on MARC's Penn Line commuter service to Washington. Most Penn Line trains terminate here, with some continuing to Martin State Airport or Perryville. Amtrak owns the station, which serves nine of Amtrak's Northeast Corridor services. Acela Express and Northeast Regional trains from Penn Station serve destinations along the Northeast Corridor between Boston and Washington, D.C. Some Regional trains from the station continue into Virginia and serve Alexandria, Newport News, Norfolk, Roanoke, and points in between. Other long-distance trains from the station serve: St. Albans, Vermont Charlottesville, Virginia Raleigh and Charlotte, North Carolina Atlanta, Georgia New Orleans, Louisiana Jacksonville, Orlando, Tampa, and Miami, Florida Huntington, West Virginia Cincinnati, Ohio Indianapolis, Indiana Chicago, Illinois Although Amtrak owns the station, its Superliner railcars cannot enter due to inadequate clearances in the B&P and Union tunnels. In the 1970s and 1980s, Amtrak also offered service to Harrisburg and Pittsburgh, Pennsylvania, St. Louis, Missouri, and Atlantic City, New Jersey. Before Amtrak's creation on May 1, 1971,