The $16 billion Hudson Tunnel Project connecting New York and New Jersey has reached one of its most important physical construction milestones, with the Gateway Development Commission beginning the first tunnel-boring phase for the new passenger-rail connection beneath the Hudson corridor. Two tunnel boring machines are being prepared to excavate approximately 5,100 feet through the Palisades on the New Jersey side, marking the transition from years of funding, access, ground preparation and enabling works into sustained underground excavation.
The first machine is expected to begin excavation after final testing, with the second following shortly afterwards. Each machine weighs more than 1,680 tons, carries a cutterhead measuring 28 feet 8 inches across and extends roughly 500 feet through its trailing equipment. Gateway Development Commission expects the machines to advance at an average of about 30 feet per day, including maintenance periods, putting the Palisades section on an approximately one-year boring cycle.
The milestone gives the Hudson Tunnel Project something infrastructure programmes often spend years trying to reach: a visible, repetitive production process that converts preparatory spending into permanent tunnel. The Palisades works represent only one construction package within the wider project, but progress here is critical because the completed programme must eventually deliver a new twin-tube rail tunnel, nine miles of new passenger-rail infrastructure and rehabilitation of the existing North River Tunnel that has served the corridor since 1910.
Why is tunnel boring under the Palisades such an important Hudson Tunnel Project milestone?
Large underground infrastructure programmes rarely begin with the dramatic image of a tunnel boring machine cutting rock. Before excavation can start, project teams must build shafts and launch structures, relocate utilities, create access points, assemble enormous machines, establish logistics systems and ensure that the ground and surrounding infrastructure can tolerate sustained tunnelling activity. The Palisades launch therefore represents the point at which several years of less-visible enabling work begin feeding directly into tunnel production.
The two machines will bore parallel tubes through hard rock from North Bergen towards the Hudson County Access Shaft near the Weehawken-Hoboken border. As they advance, equipment behind each cutterhead will install precast concrete segments to form the permanent tunnel lining, meaning the excavation and structural construction processes move forward together. More than 1,000 sensors are incorporated into each machine to track position, equipment wear, tunnel conditions and other operating parameters.
Once this section is completed, the Palisades machines are expected to be removed through the access shaft. A different pair of machines suited to the ground conditions beneath the Hudson River will then undertake subsequent tunnelling towards Manhattan. This staged equipment strategy illustrates why the Hudson Tunnel Project is better understood as an interconnected portfolio of heavy civil-engineering packages than as a single tunnel contract.
Who is building the first bored section of the Hudson Tunnel Project?
Gateway Development Commission awarded the Palisades Tunnel Project to Schiavone Dragados Lane Joint Venture following a competitive procurement process. The contract was approved at a price of $465.6 million, with an additional contingency authorisation equal to 5% of the contract price. The scope covers the first approximately one-mile section of twin tunnels on the New Jersey side as well as six cross passages, tunnel lining and construction of the Hudson County Shaft used to remove the boring machines.
The contract was awarded in August 2024, illustrating the long lead time between contractor selection and the start of continuous tunnel excavation. Since then, the programme has required machine manufacturing, transport and reassembly along with extensive construction at the North Bergen launch area and access-shaft sites. The current boring milestone is therefore also an execution test of the procurement and sequencing decisions made more than two years earlier.
The broader programme has numerous major contractors working across separate packages. Gateway Development Commission’s current vendor information identifies different teams for the Palisades Tunnel, Manhattan Tunnel, Hudson River Tunnel Section and ground-stabilisation works, creating multiple simultaneous fronts rather than waiting for one section to finish before another can begin.
How is the $16bn Hudson Tunnel Project funded?
The project reached full funding in July 2024 when Gateway Development Commission secured the financing commitments required for completion. The funding structure included a $6.88 billion Full Funding Grant Agreement with the Federal Transit Administration and approximately $4.06 billion in Railroad Rehabilitation and Improvement Financing loans used to support the local share. Gateway Development Commission said the total federal commitment reached about $12 billion within the overall $16 billion project framework.
That financial structure matters because megaproject schedules can be destabilised when contractors mobilise faster than committed funding becomes available. Securing the overall financing framework before the most capital-intensive tunnelling phases reduces one source of uncertainty, although cost control, programme interfaces, construction productivity and schedule performance remain central risks throughout the remainder of the build.
Gateway Development Commission currently describes seven of the project’s ten construction packages as either completed or in progress. The new tunnel is targeted to open for passenger service in 2035, after which rehabilitation of the existing North River Tunnel is expected to continue, with that work scheduled for completion in 2038.
Why does the Hudson Tunnel Project matter beyond New York and New Jersey commuters?
The existing North River Tunnel forms part of the Northeast Corridor, which concentrates some of the most economically important passenger-rail traffic in the United States. Gateway Development Commission estimates that approximately 200,000 passengers stand to benefit from more reliable journeys once the Hudson Tunnel Project is complete. The existing tunnel’s age and operational importance mean that disruption is not merely a local commuting issue but a potential constraint on intercity passenger movements along the wider East Coast corridor.
Gateway Development Commission estimates construction itself will support approximately 95,000 jobs and generate $19.6 billion in economic activity. It also estimates that the programme purchases an average of about $87 million of goods and services each month, illustrating how expenditure on a project of this scale spreads through engineering, construction materials, equipment, professional services and local supply chains well before the first passenger uses the new tunnel.
The economic argument extends to avoiding disruption of the existing infrastructure. Gateway Development Commission has estimated that taking one North River Tunnel tube out of service for an extended rehabilitation without first creating replacement capacity could impose approximately $16 billion in economic costs through lost time, wages and wider disruption. The new tunnel therefore creates the capacity required to rehabilitate the ageing asset without imposing the same level of operational constraint.
What could determine whether the Hudson Tunnel Project stays on schedule?
The start of tunnel boring reduces some early-stage uncertainty but introduces a different set of risks. Underground conditions, cutter wear, machine availability, material logistics and interface management between contractors can all affect actual advance rates. Gateway’s 30-foot-per-day assumption already includes planned maintenance periods, suggesting that programme scheduling has been built around a realistic operating cycle rather than an uninterrupted theoretical maximum.
Coordination will become increasingly important as multiple packages converge. The Palisades tunnels must connect accurately with subsequent Hudson River sections, shafts and Manhattan works, while systems installation and fit-out will eventually have to follow civil construction. The programme’s modular contracting structure spreads delivery across specialist teams, but it also makes interface discipline essential.
For now, the September milestone materially changes the project’s status. The Hudson Tunnel Project is no longer principally a story about securing funding, awarding packages or preparing work sites. Giant machines are beginning the repetitive task of converting a $16 billion programme into permanent railway infrastructure, and their underground progress will provide one of the clearest measures yet of whether the project’s ambitious 2035 service target remains achievable.
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