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7 Subway Extension

From MedBib.com - Medicine & Nature

The 7 Subway Extension — Hudson Yards Rezoning and Development Program is the New York City Metropolitan Transportation Authority's (MTA) plan to extend the IRT Flushing Line, which carries the 7 service, westward from its current terminus at Times Square, adding one new station at Eleventh Avenue–34th Street. A second station at Tenth Avenue–41st Street was dropped from the plans in October 2007, but could be restored if funding can be found.^[1] In February 2009, the MTA announced that it would build the station at Tenth Avenue and 41st Street if the agency received sufficient funds from the proposed federal economic stimulus package.^[2] The extension is expected to be operational by 2013.^[3]

Contents 1 Hudson Yards Redevelopment Project 2 Construction progress 3 Future extension southward 4 See also 5 References 6 External links

Hudson Yards Redevelopment Project

The extension, part of the Hudson Yards Redevelopment Project, is intended to aid redevelopment of the west side of Midtown Manhattan around the Long Island Rail Road's West Side Yard, and was originally proposed as part of the failed attempt to build the West Side Stadium for the New York Jets and the city's bid for the 2012 Summer Olympics. Although the stadium plan was rejected by city and state planning agencies, the 7 subway extension plan was given the green light to move ahead, as New York political leaders would like to see the warehouse district west of 8th Avenue and north of 34th Street redeveloped, and subway service would be an essential part of that effort. The extension would also serve the newly expanded Jacob K. Javits Convention Center.

Construction progress

In October 2007, the MTA awarded a $1.145 Billion contract to build 7,000 feet (2,100 m) of twin-tube tunnel from the current 7 line terminus in Times Square, and the shell of the 34th Street station, to S3, a joint venture of Skanska USA Civil, J.F. Shea, and Schiavone.^[1][4][5] Richard Dattner and Partners, Architects, designed the Jacob Javits Convention Center station.^[6] The 41st Street and 10th Avenue station is not included in the contract award; however, a $450 Million option to build a shell for the station was included as part of the contract, and must be acted on by the city within nine months, if the city wants to have a station shell built as part of the initial contract. After excavating the new terminal's shell and creating the first 1,000 feet (300 m) of tunnel using the drill-and-blast method, S3 will place two tunnel-boring machines in the ground to dig the remaining 6,000 feet (1,800 m); as it digs, the TBM will place precast concrete liner segments to create the tunnel interior.

In September 2007, it was announced that the new station on the line will feature platform screen doors.^[7] The new station (along with the new South Ferry station on the 1 line) will include special air-cooling systems to reduce the temperature along platforms.^[8]

On December 3, 2007, the MTA conducted a ceremony at the Times Square subway station marking the launch of construction of the 7 line extension. MTA's contractor began excavating the station cavern adjacent to the Javits Convention Center. MTA posted a construction update with photographs on its website in November 2008, showing substantial progress.^[9] Reports in late December 2007 indicate that the postponed 41 Street/10th Avenue station might be partially built if the City of New York and MTA can come to terms on the additional financing for the station shell.^[10]

Mayor Michael Bloomberg's December 12, 2006 address to the League of Conservation Voters noted that in November 2006, the government began issuing bonds to fund the extension of the No.7 subway line to 11th Avenue and 34th Street.^[11] The $2 Billion 7 subway extension is being funded with New York City funds from municipal Tax Increment Financing (TIF) bond sales that are expected to be repaid with property tax revenues from future developments in areas served by the extension.^[12]

One of the physical hindrances to the construction of the extension is the IND 42nd Street–Port Authority Bus Terminal station's inclusion of a lower-level platform, ironic because the lower-level, downtown only platform was built by the IND most likely to prevent the IRT from extending west what is now the 7 train. The now-abandoned platform will have to be partially razed in order for the 7 train extension to be built.^[13]

In June 2008, construction on the tunnels began along 11th Avenue in Manhattan. In February 2009, the MTA lowered a tunnel-boring machine into a giant shaft at the corner of 25th Street and 11th Avenue.^[14] Two boring machines were lowered into the shaft in the spring of 2009, and are digging parallel 7,100-foot (2,200 m) long tunnels north along 11th Avenue to the current terminus of the 7 Line at 41st Street and Times Square. On December 21, 2009, the MTA said a tunnel-boring machine broke through the 34th Street station cavern wall.^[15] Both tunnel-boring machines are scheduled to finish the required tunneling in the spring of 2010.^[16]

In June 2009, the MTA completed excavation of a 150-foot (46 m) long cavern within the Port Authority Bus Terminal's basement, which will form part of the northern end of the new extension and connect it to Times Square. The cavern lies just below the bus entrance ramp to the terminal's lower level.^[3]

Future extension southward

The 7 subway extension will have service tracks that extend to near 23rd Street. These tracks will be used for moving and storing trains. This track segment opens up the possibility that the line could be extended further south to 23rd Street and 11th Avenue to a possible future station to serve the Chelsea section of Manhattan and Chelsea Piers, which has become a popular recreation facility.^{[citation needed]}

See also

• Hudson Place
• Second Avenue Subway

References

External links

• 7 Subway Extension Update - Official MTA 7 Subway Extension Project Page (updated November 2008)

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