Nicholas Avenue; and 96th Street and Broadway to Central Park North and Lenox Avenue.
Ridership continues to increase, and on September 23, 2014, more than 6.1 million people rode the subway system, establishing the highest single-day ridership since ridership was regularly monitored in 1985.
Of the system's 25 services, 22 pass through Manhattan, the exceptions being the G train, the Franklin Avenue Shuttle, and the Rockaway Park Shuttle.
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.
Ridership had dropped to 1910s levels, and graffiti and crime were rampant on the subway; in general, the subway was very poorly maintained during that time, and delays and track problems were common.
Still, the NYCTA managed to open six new subway stations in the 1980s, Entering the 21st century, progress continued despite several disasters.Street railways had to be torn up to allow the work.The foundations of tall buildings often ran near the subway construction, and in some cases needed underpinning to ensure stability.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.Rebuilding required the suspension of service on that line south of Chambers Street. By March 2002, seven of those stations had reopened.