Proposals to extend the transit system to the Far West Side to support massive redevelopment were floated as early as 1969, when the New York City Planning Commission's (CPC's) master plan proposed to expand midtown westward along a 48th Street transit line to replace what the plan described as "blocks of antiquated and deteriorating structures of every sort" between Eighth and Twelfth avenues. That proposal for the West 40s and 50s failed after voters rejected a state bond issue that would have financed the proposed new east–west transit line or "people mover." Subsequently, attention shifted to the West 30s and the IRT Flushing Line.
In response to the CPC's 1993 proposal to improve access to the Manhattan Central Business District, the Metropolitan Transportation Authority (MTA) began exploring the possibility of a 7 extension to New Jersey. In June 2001, a business and civic group convened by Senator Charles Schumer argued that a westward extension of the Midtown office district could not be accomplished without a subway extension, saying:
The long blocks along the avenues make the walk as long as 20 minutes to the westernmost parts of the area. In addition, there is no convenient link from Grand Central Station or elsewhere on the east side of Manhattan, making the Far West Side a difficult commute for workers from parts of Manhattan, Queens, Westchester and Connecticut.
However, in October 2007, soon after the announcement of the new extension, the 10th Avenue station was canceled due to an overrun of the $2.4 billion budget, and the MTA did not have an extra $500 million to build the 10th Avenue station. On December 3, 2007, the MTA conducted a ceremony at the Times Square subway station marking the launch of construction of the 7 train extension. The contractor began excavating the station cavern adjacent to the Javits Convention Center. One physical hindrance to the construction of the extension was the lower-level platform at 42nd Street–Port Authority Bus Terminal on the IND Eighth Avenue Line. The abandoned platform was partially razed to allow the 7 train extension to be built. In order for the TBMs to meet up with the existing lay-up tracks west of Times Square, the Eighth Avenue Line had to be underpinned to support the existing line.
In June 2008, construction on the tunnels began along Eleventh Avenue in Manhattan. In February 2009, S3 lowered the first of two tunnel-boring machines into a giant shaft at the corner of 25th Street and Eleventh Avenue. The two boring machines dug parallel 7,100-foot (2,200 m) long tunnels north along Eleventh Avenue to the current terminus of the 7 service at 41st Street and Times Square. The MTA posted a construction update with photographs on its website in November 2008, showing substantial progress.
The MTA completed excavation of a 150-foot (46 m) long cavern in June 2009. The cavern was dug below the bus entrance ramp to the lower level of the Port Authority Bus Terminal and formed part of the eastern end of the new extension and connected it to the Times Square station. At the same time, tunnels were being dug northward from the machine shaft at 26th Street; soft ground at 27th and 28th Street required 300 feet (91 m) of ground to be frozen so that the tunnel-boring machines could easily dig through the soil. On December 21, 2009, it was announced that a tunnel-boring machine broke through the 34th Street station cavern wall. Both tunnel-boring machines were scheduled to finish the required tunneling in the spring of 2010.
In June 2010, one of the TBMs completed its tunnel at the cavern. The second TBM broke through the wall of the cavern on July 15, 2010, completing its tunneling operation. The TBMs were partially disassembled and backed up to the 25th Street shaft, where they were lifted out. In April 2011, the MTA announced that the contract covering the tunnels, the 34th Street station mezzanine and passenger platform was 85% complete, and that the systems contract, covering mechanical and electrical systems, electric power, lighting and train tracks would be awarded by July 2011. A second entrance to the station is planned. In May 2012, the MTA announced that the extension, now 65% complete, had received the installation of the first set of rails.
On August 21, 2013, the MTA announced that the 7 Subway Extension was 90% complete. On December 20, 2013, Mayor Michael Bloomberg took a ceremonial ride on a train to the new terminal, celebrating a part of his legacy as Mayor; at the time, the proposed opening date was June 2014.
Soon after Bloomberg's ceremonial ride, the opening date of the subway extension was postponed from June to early fall 2014, then to November 2014, then to February 2015, and then to May 2015. Most of the problems were attributed to the incline elevators being installed in the station, and to the ventilation fans along the tunnel.
Just two and a half months later, though, the MTA stated that it was unable to open the subway extension for service until April to July 2015, due to the failure to get the inclined elevators to work properly. Problems with the security and fire alarm systems were also blamed for the delays. A December 2014 New York Post article attributed the delay to the Hudson Yards rail yard development's developer, The Related Companies', need to dig caissons for the foundations, just above the subway station, and the foundation work needed to be complete before the MTA could open the station. Continuing trouble with the fire and security alarms in March 2015 would delay the opening until summer.
The use of inclined elevators was intended to provide wheelchair-using patrons with a shorter, easier path to the train platform, as well as to reduce tunneling costs. The two elevators were manufactured by Maspero Elevatori, in Appiano Gentile, Italy, using a controller made on Long Island, speed governors made in Ohio, and buttons and other parts in Queens. The software for the elevator was written in the United States. Maspero Elevatori assembled the elevators in Italy, and they failed an operational test there, prior to being shipped to the United States. The MTA said the manufacturer chose to use American subcontractors in place of local Italian suppliers after reading the specifications the transit agency submitted. The MTA had been working with the manufacturer to try to resolve the problems caused by a very high level of customization.
On June 1, 2015, a representative for the MTA described the extension as "99% complete". That day, test runs of 7 trains started running to 34th Street–Hudson Yards in preparation for the summer 2015 opening of the extension. However, on June 15, the extension was postponed again to "before the end of the third quarter". On July 20, 2015, it was reported that the MTA planned to open the extension to the public on September 13, 2015. The opening date was confirmed on August 28, 2015. The station was opened at a ribbon-cutting ceremony on September 13 at about 1 p.m.
Passenger access to the station includes a pair of incline elevators. The project has been plagued by delays because of the mishaps involved in the installation of the custom-made elevators. In June 2012, the extension's opening was delayed to June 2014, with the rest of the 34th Street–Hudson Yards station to open at the end of 2015; As of December 15, 2014[update], the opening date was changed to mid-2015. In April 2014, the first of the 170-foot-long (52 m) incline elevators was installed in the station. The 80-foot (24 m) high incline elevators are the first of their kind in the system. The station is the third station in the New York City Subway to have low vibration tracks installed. These tracks provide a smoother, quieter ride for passengers, and eliminate the need for wooden track blocks.
Although a new station at 10th Avenue and 41st Street was part of the original plan, the intermediate station was eliminated in October 2007 due to cost overruns, leaving the terminal station at Eleventh Avenue and 34th Street as the only new station on the extension. The MTA indicated that the 10th Avenue station could be included in the project if funding were found. The station was not included in the original (2007) contract award, but was listed as a $450 million option. In late December 2007, reports indicated that the postponed station might be partially built if the City of New York and the MTA agreed on the additional financing for the station shell. In February 2009, the MTA announced that it would build the station if the agency received sufficient funds from the federal economic stimulus package. In June 2010, the city announced it was seeking funding to assess the feasibility of constructing the station at a later date using a two-platform, two-entrance model without an underground connecting passage.
Construction of the line proceeded to its completion in 2014 without the station or its shell. In January 2016, the New York City Economic Development Corporation released a request for proposal (RFP) for a site of a proposed development at 41st Street and Tenth Avenue, including a study into the 10th Avenue station's feasibility. The new station was projected to cost $1 billion at the time. New York City Council candidate Erik Bottcher proposed completing the station in mid-2021, and elected officials again pushed for the station's construction in August 2022. By 2023, the MTA predicted that the station could cost $1.9 billion.
On February 2, 2011, the city's Economic Development Corporation voted to budget up to $250,000 for a feasibility study of the proposed New Jersey extension, carried out by engineering firm Parsons Brinckerhoff. Amtrak's February 2011 announcement of the Gateway Project, which entailed two new commuter rail tunnels under the Hudson River, included a proposal to extend the 7 service three blocks east of Eleventh Avenue to New York Penn Station, instead of five miles west to Secaucus. Congress allocated $15 million for studies for the project in November 2011, with the likelihood that Gateway and the subway extension would be in competition for funding. In April 2012, citing budget considerations, the director of the MTA, Joe Lhota, said that it was doubtful the extension would be built in the foreseeable future. After the Parsons Brinckerhoff feasibility study was released in April 2013, Bloomberg said: "Extending the 7 train to Secaucus is a promising potential solution ... and is deserving of serious consideration." In November 2013, the New Jersey Assembly passed Resolution 168 supporting the extension of the line to Hoboken and Secaucus.
In 2017, a further extension of the 7 train to New Jersey was suggested once again, this time as an alternative to constructing a replacement for the Port Authority Bus Terminal. An alternative would include a new terminal at Secaucus Junction in connection with the 7 extension. In February 2018, it was revealed that the Port Authority had advertised for consultants to write an 18-month feasibility study for such an extension, and that it had received bids from several companies. This extension was being planned along with the Gateway Project and, if built, would be able to accommodate a projected 38% increase in the number of people commuting between the two states. If the New Jersey subway extension were constructed, it could complement the Gateway Project, which was predicted to become overcrowded by 2040. At the time, the Port Authority was upgrading the PATH system, the only rapid transit link between New York and New Jersey, to accommodate more frequent trains.
The New York State Society of Professional Engineers awarded the first construction phase, "Running Tunnels and Underground Structures," its 2013 Construction Project of the Year. According to the society, the project team won the award "for outstanding professional engineering efforts in developing creative solutions and innovative technologies in construction of an infrastructure project. The No. 7 project used the first double-shielded tunnel boring machines (TBMs) to tunnel under New York City while placing precast concrete segments to form the tunnels' walls. For the first time in the world, a ground freezing method was used to harden soil to act as rock to allow TBMs to maintain proper course while boring and placing the tunnel liners." While the extension extends 1 mile (1.6 km), the tunnels are actually 1.5 miles (2.4 km) long.
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