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Mark your calendars for December 2016.

The MTA Capital Construction is saying the $4.45 billion project is on track to open on time and under budget.

Phase 1 construction began in April 2007. It will change and extend the Q train from 63rd Street and Lexington in Manhattan to 96th Street. New stations are being built at 72nd, 86th and 96th Streets.

Phase 2 takes the line to 125th Street. That project is included in the list of items for the next capital program which has not been fully funded.

Phase 3 would create the "T" train; that would run from 125th Street along Second Avenue with the Q line to 72nd Street. The T line would continue to to Houston Street. Phase 4 would bring the T to Hanover Square in lower Manhattan.

The MTA estimates the new section will serve 200,000 daily riders and ease congestion on the 4,5, and 6 lines along Lexington Avenue (the busiest line in the city and the country).

The Q will not run into Queens when this section comes on-line. The MTA says service needs there will be addressed and the plan is being determined.

second ave subway tour

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