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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.However, tunnelling shields were required for deeper sections, such as the Harlem and East River tunnels, which used cast-iron tubes.Rock or concrete-lined tunnels were used on segments from 33rd to 42nd streets under Park Avenue; 116th to 120th Streets under Broadway; 145th to Dyckman Streets (Fort George) under Broadway and St.The immediate damage was fixed within six months but long-term resiliency and rehabilitation projects continue.Contractors in this type of construction faced many obstacles, both natural and man-made.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.
The rest (except for Cortlandt Street on the IRT Broadway–Seventh Avenue Line) In October 2012, Hurricane Sandy wreaked havoc, flooding several underwater tunnels and other facilities near New York Harbor, as well as trackage over Jamaica Bay.
and exhibited his idea for a subway propelled by pneumatic tube technology.
The tunnel was never extended for political and financial reasons, although extensions had been planned to take the tunnel southward to the Battery and northwards towards the Harlem River.
Nicholas Avenue; and 96th Street and Broadway to Central Park North and Lenox Avenue.
All of these construction methods are completely grade-separated from road and pedestrian crossings, and most crossings of two subway tracks are grade-separated with flying junctions.