The Second Avenue Subway (internally referred to as the IND Second Avenue Line by the MTA and abbreviated to SAS) is a New York City Subway line that runs under Second Avenue on the East Side of Manhattan. The first phase of this new line, with three new stations on Manhattan's Upper East Side, opened on January 1, 2017. The full Second Avenue Line, if and when it will be funded, will be built in three more phases to eventually connect Harlem–125th Street in Harlem to Hanover Square in Lower Manhattan. The proposed full line would be and 16 stations long, serve a projected 560,000 daily riders, and cost more than 17billion.Thelinewasoriginallyproposedin1920aspartofamassiveexpansionofwhatwouldbecometheIndependentSubwaySystem(IND).InanticipationoftheSecondAvenueSubwaybeingbuilttoreplacethem,parallelelevatedlinesalongSecondAvenueandThirdAvenueweredemolishedin1942and1955,respectively,despiteseveralfactorscausingplansfortheSecondAvenueSubwaytobecancelled.Constructiononthelinebeganin1972aspartoftheProgramforAction.Itwashaltedin1975becauseofthecity′sfiscalcrisis,leavingonlyafewshortsegmentsoftunnelscompleted.WorkonthelinerestartedinApril2007followingthedevelopmentofafinanciallysecureconstructionplan.Thefirstphaseoftheline,consistingofthe96thStreet,86thStreetand72ndStreetstations,aswellasoftunnel,cost4.45 billion. A , $6 billion second phase from 96th to 125th Streets is in planning .
Phase 1 is served by the Q train at all times and limited rush-hour N and R trains. Phase 2 will extend the line's northern terminus from 96th Street to Harlem–125th Street. Both the Q and limited N services will be extended to 125th Street. Phase 3 will extend the line south from 72nd Street to Houston Street in Manhattan's Lower East Side. Upon completion, a new T train will serve the entire line from Harlem to Houston Street. Phase 4 will again extend the line south from Houston Street to Hanover Square, maintaining the T designation for the entire line.
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