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The Metropolitan Transportation Authority recently awarded the first contract for MTA New York City Transit’s (NYCT) Second Avenue Subway project. S3 Tunnel Constructors, a joint venture comprising Skanska USA Civil Northeast, Schiavone Construction and J.F. Shea won a $337 million contract to begin construction on the extension’s first phase, which will run from 96th to 63rd streets and connect with existing service to provide access to Manhattan’s west side and Brooklyn.

S3 Tunnel Constructors will launch construction next month. The contract calls for constructing a launch box between 92nd and 95th streets, from which a tunnel boring machine will excavate the subway tunnels. The parties also will build two shafts at 69th and 72nd streets, which will be used to construct 72nd Street Station.

Scheduled to be complete in 2013, the first phase includes a total of six construction contracts. NYCT still needs to award contracts to build the 96th Street, 86th Street and 72nd Street stations, rehabilitate the 63rd Street/Lexington Avenue Station, and conduct, track, signal, power and communications work.

NYCT’s first expansion in 50 years, the Second Avenue Subway project will extend the system from 125th Street to Hanover Square in lower Manhattan.