The procurement launch follows Ireland’s October 2025 Railway Order approval, previously reported by ENR, which authorized the 18.8-km MetroLink alignment and cleared the project to move from planning into construction and procurement phases.

Transport Infrastructure Ireland (TII), the project's contracting authority, released notices for the M401 and M402 civil design-and-build contracts in February and followed May 1 with the M500 design, build, finance, operate and maintain concession (DBFOM) covering rolling stock, rail systems and 25 years of operations.

Irish officials have described MetroLink as one of the largest infrastructure programs in the country's history and as part of a growing trend toward automated metro systems that separate tunnel and station construction from rail system integration and long-term operations.

Civil Work: Bored Tunnels and Deep Station Boxes

The M401 and M402 contracts divide the project's heavy civil work into two geographic packages along the 18.8-km alignment, with a combined contract notice ceiling of approximately $9.3 billion. TII stated it expects actual bids to come in considerably below that figure.

M401, with a contract notice value of approximately $5.4 billion, covers the densely urban southern section of the route and includes bored railway tunnels, tunnel portals, evacuation and intervention shafts, ventilation shafts and underground station box excavations reaching up to 35 m deep.

M402, valued at roughly $3.9 billion, spans the northern section and involves a mix of bored tunneling, cut-and-cover construction, retained-cut sections, at-grade surface work and two viaducts. Both packages use NEC4 contract forms, a collaborative procurement and project-delivery framework widely used on major U.K. and European infrastructure programs that emphasizes transparency, risk management and dispute reduction.

Three bidders will be shortlisted per package. Applicants may pursue both lots but can only be awarded one. M401 award is targeted for the third quarter of 2027; M402 follows in the fourth quarter of 2027.

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Rail Systems, Operations and Long-Term Risk Transfer

The M500 DBFOM concession is the program’s largest single procurement package at approximately $8.6 billion in net present value terms. Structured as an availability-based PPP, the concession compensates the winning consortium for maintaining operational performance standards rather than ridership levels, thereby shifting construction performance and long-term maintenance obligations to the concessionaire.

M500 scope covers the complete operating railway above the civil shell, including Grade of Automation 4, or GoA4, driverless rolling stock and signaling systems designed for unattended train operation.

The package also includes line-wide trackwork, an overhead contact system, platform screen doors, tunnel and station ventilation, elevators, escalators and other people-movement systems and all mechanical and electrical fit-out across 16 stations.

The underground stations include multilayer concourses, mezzanines and underplatform service levels, integrating traction substations, signaling rooms, firefighting systems and vertical circulation infrastructure. Railway-order plans also show integrated operations-control facilities, UPS and electrical rooms, and platform-screen-door assemblies embedded within the station structures.

The consortium will also build a railway depot and maintenance facility, an operations control center and a 3,000-space park-and-ride facility, then operate and maintain all assets for 25 years following an approximately seven-year construction period—a total concession term of roughly 32 years.

The structure resembles delivery models used in other automated metro programs, where agencies separated heavy civil construction from rail systems integration and operations to reduce interface risk and broaden bidder participation.

MetroLink’s engineering reference design has been led since 2018 by IDOM and Jacobs, while international consortiums involving firms including Alstom, FCC, John Laing, Meridiam and RATP have publicly signaled interest in the DBFOM concession, according to documents reviewed by ENR.

The M500 pre-qualification questionnaire, or PQQ, is open now, with invitation to tender targeted for early 2028 and financial close expected in the fourth quarter of 2028. Three bidders will be shortlisted for competitive dialogue.

TII CEO Lorcan O'Connor said the M500 contract "has been carefully structured to allocate risk appropriately, encourage innovation, and ensure long-term operational excellence."

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Civil-Systems Interface

The split-package structure creates a defined handover boundary: M400 civil contractors deliver the tunnel bores and station structural shells, while the M500 concession contractor completes fit-out and integrates all rail systems within that envelope.

MetroLink has published a space-proofing reference design to govern that interface, with M400 design requirements derived from assumptions established for the M500 package.

Program Director Dr. Sean Sweeney called the civil contract notices "a significant step forward in delivering Ireland's first metro system," adding that "reaching this point is the result of sustained effort and collaboration."

Property and railway-order plans show the alignment threading beneath dense residential and commercial districts requiring subsurface acquisitions, utility relocation corridors and protection of existing basements and lightwells.

A suite of earlier enabling works contracts is already in procurement, covering utility diversions, archaeological clearance and construction of the Dublin Airport station box—a technically complex early undertaking within the constrained operational footprint of Dublin Airport that must be completed before major tunneling can ramp up.

When operational, MetroLink is designed to carry up to 20,000 passengers per direction per hour at peak, with an initial peak frequency of three minutes and a long-term target of 90-second headways. Annual ridership capacity is projected at up to 53 million passengers.

Those performance targets place systems integration and long-term asset reliability at the center of the M500 concession rather than treating them as secondary work following civil construction.