North River Tunnels

North River Tunnels

Company type	Infrastructure
Industry	Rail transport
Founded	1904
Founder	Pennsylvania Railroad
Headquarters	New York City and North Bergen , United States
Area served	New York metropolitan area
Products	Rail tunnel passage for Amtrak and New Jersey Transit trains

The North River Tunnels consist of a pair of rail tunnels that facilitate passenger service for Amtrak and New Jersey Transit beneath the Hudson River, linking North Bergen, New Jersey with New York Penn Station located in Manhattan, New York City. Built between 1904 and 1908 by the Pennsylvania Railroad (PRR) to provide direct access to Manhattan, these tunnels commenced operations in late 1910.

Capable of handling up to 24 two-way train movements each hour, the tunnels frequently operate at or near full capacity during peak travel periods. They suffered extensive flood damage during Hurricane Sandy in 2012, which has caused recurrent service disruptions. By May 2014, Amtrak announced that maintenance closures affecting one or both tunnels would be necessary within two decades.

In May 2021, the U.S. Department of Transportation (USDOT) authorized the construction of a pair of new tunnels, referred to as the Gateway Tunnels, anticipated to open by 2035. Restoration work on the original tunnels is projected to conclude by 2038.

Background

By 1871, the PRR had unified its New Jersey railroads through leasing the United New Jersey Railroad and Canal Company, thereby extending its rail lines from Philadelphia to Jersey City, New Jersey. Despite this expansion, crossing the Hudson River remained problematic; passengers were required to transfer to ferries to reach Manhattan, unlike PRR’s competitor, the New York Central Railroad, which provided direct Manhattan service from the north.

After unsuccessful attempts to construct a bridge over the Hudson, PRR and the Long Island Rail Road (LIRR) introduced plans in 1892 for enhanced regional rail connectivity under the New York Tunnel Extension. These proposals included tunnels connecting Jersey City, New Jersey to Manhattan, a new terminal in Midtown Manhattan serving both railroads, completion of the Hudson Tubes (later known as PATH), and a bridge concept. Progress on these initiatives accelerated around 1900 when PRR established subsidiaries such as the Pennsylvania, New Jersey and New York Railroad (incorporated February 13, 1902), which oversaw construction of the North River Tunnel and its approaches in New Jersey.

The original proposal from June 1901 envisioned a Hudson River bridge spanning between 45th and 50th Streets in Manhattan with adjacent terminals for both LIRR and PRR, enabling uninterrupted travel between Long Island and New Jersey without changing trains. By December of that year, however, plans pivoted toward creating tunnels beneath the Hudson instead of a bridge due to lower costs—tunnel construction was estimated at roughly one-third the expense of building a bridge. The design called for two to four steel tubes approximately in diameter.

This project encountered resistance from the New York City Board of Rapid Transit Commissioners and the Interborough Rapid Transit Company, who expressed concerns about control over transit routes and competition with existing services. Despite opposition, approval was narrowly granted by the New York City Board of Aldermen in December 1902 with a vote of 41–36. The North and East River Tunnels were built beneath their respective riverbeds and converged at New York Penn Station, an impressive Beaux-Arts terminal situated between 31st and 33rd Streets in Manhattan. The total cost for this endeavor surpassed $100 million.

Design and construction

The tunnel design initiative commenced in 1902 under the leadership of Chief Engineer Charles M. Jacobs. In 1904, the contract to construct the North River Tunnels was granted to O'Rourke Engineering Construction Company. Initially envisioned as three separate tubes, the plan was later scaled back to two. The early phase included excavating two shafts: a smaller one near 11th Avenue on Manhattan’s east side and a larger shaft located in Weehawken on the west side. Work on the Weehawken Shaft started in June 1903 and concluded by September 1904; it featured a concrete-lined rectangular structure measuring at its base and extending deep.

Following the completion of the shafts, O'Rourke advanced with tunnel excavation by dividing the project into three sections overseen by resident engineers: the Terminal Station area in Manhattan; the underwater River Tunnels beneath the Hudson River; and the Bergen Hill tunnels stretching westward from Weehawken to portals on The Palisades. The construction process utilized drilling and blasting techniques combined with tunneling shields positioned at three points progressing toward one another—westward from Manhattan, both eastward and westward from Weehawken, and eastward from Bergen portals.

Beneath the riverbed, excavation began in solid rock using drill-and-blast methods; however, deeper layers consisted of thick mud requiring compressed air excavation supported by 194-ton shields that met approximately midway from each portal. The mud’s toothpaste-like texture facilitated directional control when some of it was allowed through front holes. Once excavated, the tunnels were lined with segmental cast-iron rings, each 22 tons in weight and wide, bolted together and covered with a layer of concrete. The northern tube sections were joined in September 1906, establishing it as the longest underwater tunnel globally at that time.

Concurrently, John Shields Construction Company initiated tunneling through Bergen Hill in 1905; William Bradley assumed control in 1906. By April 1908, the tunnels connecting to the New Jersey Meadowlands were finished.

Opening and use

The tunnels officially opened on November 27, 1910, coinciding with the inauguration of the New York Tunnel Extension to Penn Station. Prior to this extension, Pennsylvania Railroad (PRR) trains terminated at Exchange Place in Jersey City. The extension branched off two miles northeast of Newark, traversing the Jersey Meadows before entering the North River Tunnels en route to Penn Station. The project also encompassed construction of the Portal Bridge over the Hackensack River and established the Manhattan Transfer interchange with the Hudson and Manhattan Railroad (now PATH). This development made PRR unique as the sole railroad offering direct rail access into New York City from southern routes.

In 1967, implementation of the Aldene Plan allowed trains operated by Central Railroad of New Jersey (CNJ) and Reading Railroad (RDG) to reach Newark Penn Station, facilitating connections with PRR and PATH services into New York. The Pennsylvania Railroad merged into Penn Central Transportation in 1968, which subsequently filed for bankruptcy in 1970. Conrail assumed control over its suburban rail operations in 1976, followed by NJ Transit taking over operations in 1983. Meanwhile, Penn Central’s intercity services—including portions now part of the Northeast Corridor and Empire Corridor—were transferred to Amtrak in 1971. Amtrak took ownership of the North River Tunnels in 1976, while NJ Transit continued operating trains through them under contract.

Portals

The western portals are situated in North Bergen, New Jersey, close to the eastern terminus of Route 3 at the intersection with U.S. Route 1/9. From there, the tunnels extend beneath North Bergen, Union City, and Weehawken, reaching the eastern portals located at 10th Avenue and 32nd Street in Manhattan. Just east of 10th Avenue, the two Manhattan portals widen into 21 tracks that serve the platforms at Penn Station. The structure at 450 West 33rd Street—currently known as Five Manhattan West—was erected above these east portals in 1969.

The twin tunnel tubes run primarily straight and maintain a spacing of roughly 25 feet, with cross-passages positioned every 750 feet. At the Manhattan side, each tube branches out into several tracks.

Capacity and useful life

Each of the North River Tunnels can accommodate up to 24 train crossings per hour in either direction. Since 2003, peak periods have seen operations approaching this maximum capacity. The number of NJ Transit trains passing through on weekdays grew from 147 in 1976 to 438 by 2010. Generally, westbound trains utilize the northern tube while eastbound services travel through the southern tube. During rush hours, approximately 24 trains traverse each tunnel tube.

Beneath the river, the parallel tubes are spaced about 25 feet apart center-to-center and expand to a total of 21 tracks just west of Penn Station.

Expansion and restoration proposals

Starting in the 1990s, various initiatives have been proposed to construct additional tunnels beneath the Hudson River to boost capacity along the Northeast Corridor and facilitate maintenance on the aging existing tunnels. A comprehensive strategy for both tunnel repair and new construction received approval in 2021.

Access to the Region's Core

Access to the Region's Core (ARC), launched in 1995 by the Port Authority of New York and New Jersey (PANYNJ), NJ Transit, and the Metropolitan Transportation Authority, was a Major Investment Study focused on transit enhancements within the New York metropolitan area. It concluded that strengthening connections among key rail hubs—Penn Station, Grand Central Terminal, and Midtown Manhattan—would best meet long-term transportation objectives. The East Side Access project, which involved building tunnels under the East River to redirect some Long Island Rail Road traffic to Grand Central Terminal, was completed in January 2023.

The Trans-Hudson Express Tunnel (THE Tunnel), named after ARC’s study, aimed to address capacity constraints on the western Hudson River crossing. Due to engineering limitations, direct connections from a new terminal to either Grand Central or existing Penn Station were deemed unfeasible. Instead, plans envisioned tunneling beneath the current rail yard to create a new deep cavern terminal beneath 34th Street. Amtrak identified this as a critical bottleneck in the national rail network and initially targeted completion by 2040.

ARC did not involve Amtrak directly and was ultimately canceled in October 2010 by New Jersey Governor Chris Christie over concerns about potential budget overruns. Amtrak briefly explored reviving ARC utilizing some of its preliminary work but eventually withdrew interest. According to Senator Robert Menendez, portions of ARC’s preparatory work might be adapted for use in upcoming projects. ARC’s expenses included $117 million for preliminary engineering, $126 million for final design, $15 million in construction costs, $178 million for property acquisition, plus a $161 million partially refundable insurance premium paid upfront. After ARC’s termination, Amtrak accelerated its timeline for constructing a new trans-Hudson tunnel featuring a similar but distinct design.

Gateway Program and Impact of Hurricane Sandy

On February 7, 2011, Amtrak CEO Joseph Boardman unveiled the Gateway Program, a proposed Trans-Hudson tunnel initiative, alongside New Jersey Senators Menendez and Lautenberg, with support from New York Senator Schumer and Amtrak's Board. Amtrak planned to spearhead the financing strategy, seeking funds from New York and New Jersey states, New York City, the Port Authority of New York and New Jersey (PANYNJ), the Metropolitan Transportation Authority (MTA), as well as private sector investors. By 2017, the estimated expenditure for the project had reached $12.9 billion.

Hurricane Sandy struck in October 2012, flooding the North River Tubes with seawater for the first time in their existence and causing damage to electrical and drainage infrastructure. This flooding, coupled with the tunnels’ advanced age, led to increased equipment failures and frequent operational delays. Between 2014 and 2018, issues stemming from the North River Tubes and Portal Bridge resulted in nearly 2,000 hours of delays. The Gateway Program’s importance rose sharply after this event; in 2014, Boardman cautioned that tunnel closures could become necessary within two decades. The draft Environmental Impact Statement was published in July 2017.

For several years, funding remained uncertain due to limited commitments from New Jersey and federal agencies. To oversee construction efforts, a Gateway Development Corporation was established in 2015 with representatives from Amtrak, the Port Authority, and the U.S. Department of Transportation (USDOT). Cost-sharing agreements were reached among federal entities and state governments. Initially, the Trump administration questioned financial support; by late 2017, a federal official described previous agreements as effectively "nonexistent." Nevertheless, in March 2018, Congress approved up to $541 million for the initiative. Subsequently, in June 2019, New York and New Jersey legislatures formed the bi-state Gateway Development Commission to coordinate planning, funding, and construction activities.

In February 2020, Amtrak announced it would commence renovations on the North River Tunnels regardless of Gateway Program progress. On May 28, 2021, USDOT granted formal approval to the project despite unresolved funding issues. By August 31, 2022, projections by the Gateway Development Commission anticipated completion of new tunnels by 2035 and rehabilitation of existing tunnels by 2038. Financing will be sourced through a combination of federal funds from the Infrastructure Investment and Jobs Act along with contributions from New Jersey and New York.

Service and Repair Strategies

During construction of the new Gateway Program tunnels, repairs on the two North River Tunnels will occur sequentially to preserve current service levels. Each set of tunnels—the existing North River Tunnels and the new Gateway tunnels—will be capable of accommodating up to 24 trains per hour once rehabilitation is complete, effectively doubling throughput capacity. The Hudson Tunnel Project aims to bolster Northeast Corridor resilience by providing redundant infrastructure that enhances operational reliability.

Currently, each North River Tunnel supports a maximum throughput of 24 trains per hour in both directions combined. Without constructing the new Hudson Tunnel, repair-related closures would necessitate single-track bi-directional operations that would slash weekday capacity by more than half. Under ideal conditions during such closures, only nine trains per hour could run—a reduction exceeding 60%—forcing commuters to depend heavily on overcrowded PATH trains, buses, and ferries throughout construction periods. In contrast, the Gateway tunnel will add an additional 24 trains per hour beneath the Hudson River, supplementing existing capacity and mitigating service interruptions.

See also

• Bergen Hill
• Bergen Tunnels
• East River Tunnels
• List of bridges, tunnels, and cuts in Hudson County, New Jersey
• List of ferries across the Hudson River in New York City
• List of fixed crossings of the Hudson River (including bridges and tunnels)
• Uptown Hudson Tubes (PATH transit tunnels inaugurated in 1908)

External links

• Contains a wide collection of construction photographs.
• Interactive graphic illustrating the North River Tunnel construction process – The New York Times
• "Tunnel to Terminus: The Story of Penn Station" – National Public Radio