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Work Advances on Subway Extension

NEW YORK CITY-City officials turn out as the first of two massive tunnel boring machines is lowered into place for the Number 7 line extension.

By Paul Bubny | Updated on February 20, 2009

NEW YORK CITY-The 100-ton tip of a tunnel boring machine was lowered into place on Thursday as city and state officials–including Mayor Michael Bloomberg and Gov. David Paterson–announced the next phase of the $2.1-billion Number 7 subway extension to the Far West Side. The completed machine is scheduled to begin excavation in April for the city’s first subway expansion in decades.

“The extension of the Number 7 train from Times Square to 34th Street and Eleventth Avenue will create jobs now and result in countless long-term benefits when it’s up and running,” says Deputy Mayor Robert Lieber in a release. “And we’re paying for it with the future revenues to be generated by the development at the Hudson Yards–a funding mechanism that essentially enables the new infrastructure to pay for itself.”

Two TBMs, designed specifically for the hard rock conditions across the project line, will excavate two 7,100-foot-long tunnels running from the assembly chamber at Eleventh Avenue from 25th Street to 41st Street, and then east to link with the existing track at Times Square. The TBMs were tested last November by the manufacturer, German-based Herrenknecht AG, and then disassembled for delivery in three separate shipments by boat.

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