Entering the 21st century , progress continued despite several disasters . 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 . Rebuilding required the suspension of service on that line south of Chambers Street . Ten other nearby stations were closed for cleanup . By March 2002 , seven of those stations had reopened . Except for Cortlandt Street , the rest reopened on September 15 , 2002 , along with service south of Chambers Street . Cortlandt Street reopened on September 8 , 2018
September 11 attacks
September 11 attacks
New York City Subway