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Large portions of the subway outside Manhattan are elevated, on embankments, or in open cuts, and a few stretches of track run at ground level.In total, 40% of track is above ground, despite the "subway" moniker.The most grandiose IND Second Subway plan, conceived in 1929, was to be part of the city-operated IND, and was to comprise almost Though most of the routes proposed over the decades have never seen construction, discussion remains strong to develop some of these lines, to alleviate existing subway capacity constraints and overcrowding, the most notable being the proposals for the Second Avenue Subway.Plans for new lines date back to the early 1910s, and expansion plans have been proposed during many years of the system's existence.They had to deal with rock formations and ground water, which required pumps.Twelve miles of sewers, as well as water and gas mains, electric conduits, and steam pipes had to be rerouted.Many lines and stations have both express and local services. Normally, the outer two are used for local trains, while the inner one or two are used for express trains.
these now operate as one division called the B Division.
The September 11 attacks resulted in service disruptions on lines running through Lower Manhattan, particularly the IRT Broadway–Seventh Avenue Line, which ran directly underneath the World Trade Center.
Sections of the tunnel, as well as the Cortlandt Street station, which was directly underneath the Twin Towers, were severely damaged.
The sole exceptions of at-grade junctions of two lines in regular service are the 142nd Street junction, various official and planning agencies have proposed numerous extensions to the subway system.
One of the more expansive proposals was the "IND Second System", part of a plan to construct new subway lines in addition to taking over existing subway lines and railroad rights-of-way.