Proposed expansion of the New York City Subway

Projects such as the TriboroRx, a circumferential line connecting the outer boroughs, the reuse of the Rockaway Beach Branch, and the further expansion of the Second Avenue Subway have all been proposed, albeit mostly unfunded.

[1][2] The route of the new subway ... comprises a main trunk north and south through Manhattan Borough on Lexington Avenue and Irving Place from the Harlem River to Tenth St. and on Broadway, Vesey and Church Sts.

To connect the outer boroughs, a four-track Brooklyn-Queens crosstown line would be designed, with the possibility for future extensions into the Bronx and Staten Island.

As the first step it is proposed to construct an interstate loop line 17.3 miles [27.8 km] in length connecting with all of the north Jersey commuters' railroads and passing under the Hudson River into New York City by two tunnels, one uptown and one downtown.

[13] In 1954, Regional Plan Association advocated for an extension of the BMT Canarsie Line from Eighth Avenue to Jersey City under the Hudson River.

One of them would have involved an extension of the IRT Flushing Line under the Hudson River with a three-track tunnel and then connect with the New York, Susquehanna and Western Railroad.

[17] 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, suggesting that the Gateway Project was a much more likely solution to congestion at Hudson River crossings.

[18] A feasibility study commissioned by the city and released in April 2013 revived hope for the project, however, with Mayor Bloomberg saying "Extending the 7 train to Secaucus is a promising potential solution ... and is deserving of serious consideration.

[22] In February 2018, it was revealed that the Port Authority of New York and New Jersey had advertised for consultants to write a feasibility study for such an extension, and that it had received bids from several companies.

[28] The plan would also take over the local tracks of the New York, Westchester and Boston Railway, and the Rockaway Beach Branch of the Long Island Rail Road.

The IND Concourse Line got funding to be extended eastward past 205th Street, but Bronx residents wanted to rehabilitate the New York, Westchester and Boston Railway right-of way.

[9] In 1942, Mayor Benjamin F. Barnes of Yonkers proposed that the Getty Square Branch of the New York Central's Putnam Division be acquired for an extension of the IRT Broadway–Seventh Avenue Line from Van Cortlandt Park.

The Board of Estimate accepted the following items into its 1954 budget from the New York City Transit Authority: In March 1954, the Transit Authority issued a $658 million construction program including the following projects:[65] In 1954, Regional Plan Association advocated for an extension of the BMT Canarsie Line from Eighth Avenue to Jersey City under the Hudson River.

[14] John T. Clancy, a Democratic incumbent running for Queens Borough President in 1961 proposed third tracking the BMT Jamaica Elevated Line to provide express service, and reactivating the Rockaway Beach Branch from Rego Park to Liberty Avenue.

[66] In July 1962, the NYCTA announced that it had asked the city for money to build a $190 million high-speed, non-stop subway line from Midtown to the Bronx.

[77] There are stub-end tunnels east of the line's northern terminus, Jamaica Center–Parsons/Archer, on both levels, which extend past the station for possible future extensions.

If the link were built, the average travel time from Manhattan to Kennedy would have been about 45 minutes using the Long Island Rail Road, including transfers.

The 7 Subway Extension was devised in the late 1990s to extend the IRT Flushing Line, which carries the 7 local and <7> express services, further westward into Manhattan.

[90] Michael Horodniceanu, chief of MTA Construction Company, told The New York Times that complications in the installation of the inclined elevator would likely cause a further delay of about three months, bringing the opening date to very late summer or early fall of 2014.

[96] As proposed under the RPA's Fourth Regional Plan,[97] a second 7 Subway Extension would be built, serving 23rd Street before connecting with the existing 14th Street/Eighth Avenue station.

[125] In mid-October 2019, the MTA announced that it would study the feasibility of restoring passenger service on the Bay Ridge Branch portion of the route.

[133][134] The Long Island Rail Road (LIRR) abandoned the Rockaway Beach Branch in 1962; ever since it has been sought after for reactivation for train service.

The Genting Group, which operates Resorts World casino and have been asked to construct the convention center, are evaluating several plans to increase transportation access.

[143] The New York Daily News' editorial board came out in support of this extension on February 21, 2017, detailing why this route is superior to Governor Andrew Cuomo’s plan for an AirTrain from LaGuardia to Willets Point.

[144] In April 2015, New York City Mayor Bill de Blasio announced a new plan for building a subway line under Utica Avenue in Brooklyn.

The new line being proposed is part of de Blasio's "One New York" plan, which aims to improve transit, reduce emissions, and fight poverty.

The fourth plan included several lists of suggestions on how to improve the city's transit system, of which subway expansion was a major component.

[155][156] As of 2022[update], a potential extension of the BMT Broadway Line to Red Hook (to be served by the W train) is being evaluated as part of the MTA's 2025–2044 20-Year Needs Assessment.

[157] As of 2022[update], a potential extension of the IRT New Lots Line (to be served by the 3 train) to Spring Creek, Brooklyn, is being evaluated as part of the 2025–2044 20-Year Needs Assessment.

The tracks would have extended eastward by 3,000 feet (910 m) to the Brooklyn Bridge-City Hall station on the New York City Subway's IRT Lexington Avenue Line.

A 1929 plan
A 1939 plan
A 1969 plan
Current services
A 1910 plan for an IRT expansion
A 1920 plan for expansion
At East Broadway on the IND Sixth Avenue Line (shown), part of a two-track station was built for the IND Worth Street Line under East Broadway, above the existing line. The indent for the never-built line is seen at the top of the picture, crossing the ceiling.
The Lexington Avenue–63rd Street subway station has two island platforms split across two levels. Their northern sides were walled off until the first phase of the Second Avenue Subway was opened. This is the station's lower level.
The Staten Island Tunnel , started in 1912, was to be complete as per the 1940 plan.
The Culver Ramp was the only completed Brooklyn proposal put forth in 1940. It opened in 1955.
The IND Concourse Line would have been extended to White Plains Road .
The AirTrain viaduct over Van Wyck Expressway would have been used by the subway under the "MetroLink" plan.
The 34th Street station on the IRT Flushing Line , which opened in September 2015, was toured by then-Mayor Michael Bloomberg in 2013.
72nd Street station cavern on the IND Second Avenue Line in January 2012.
The Triboro RX, if built, would need to share a right-of-way with the Bay Ridge Branch .
The LIRR Rockaway Beach Branch would need to be renovated in order to be reused.