Iarnród Éireann unveils FourNorth rail upgrade for Dublin northside

Iarnród Éireann Launches FourNorth to Transform Dublin Northside Rail Corridor

Iarnród Éireann has officially commenced the FourNorth programme, a transformative initiative designed to upgrade the existing two-track railway connecting Dublin Connolly and Malahide stations. As the busiest rail corridor in Ireland, this line currently suffers from severe congestion due to shared usage by DART, Northern Commuter, Belfast Enterprise, and freight services. The proposed expansion involves constructing additional tracks alongside the current infrastructure to significantly enhance capacity and reliability.

The current layout creates critical bottlenecks, particularly during peak travel times, where minor disruptions cause widespread network delays. FourNorth seeks to resolve these issues by unlocking new capacity for rail movements, ensuring smoother train flows and improved timetable performance. The project aims to create a more resilient corridor capable of supporting local, regional, and national travel needs for decades to come.

Strategic Funding and Objectives

Funded jointly by the Department of Transport and the Connecting Europe Facility Transport programme, Iarnród Éireann is publishing initial details as the project moves through early option development. The Connolly to Malahide section serves as a vital gateway for North Dublin commuters and a key link between Ireland's two largest cities.

The project targets three core improvements to address capacity constraints:

1. Increased Frequency: Enabling more frequent train services throughout the day.
2. Better Connections: Strengthening links between different modes of transport and destinations.
3. Network Resilience: Creating a stronger, more dependable rail system for all users.

Long-Term Benefits and Future Expansion

Beyond immediate gains, FourNorth plays a strategic role in Ireland's transport future by encouraging a shift from private cars to sustainable rail travel. It supports transport-oriented development by improving access to jobs and education while aligning with national climate and connectivity objectives. The project also facilitates faster, more reliable cross-border travel on the Dublin-Belfast corridor and contributes to national decarbonisation targets. Furthermore, it lays the groundwork for future expansion aligned with the All-Island Strategic Rail Review (AISRR). Potential long-term developments include heavy-rail connectivity to Dublin Airport and a proposed cross-Dublin tunnel linking the Northern Line with Heuston Station.

Public Engagement Timeline

Iarnród Éireann plans to begin public engagement in late 2026, inviting communities, passengers, businesses, and local authorities to shape the emerging design. Consultation will occur at key stages via online resources, mailed information, and public events to gather meaningful feedback from all stakeholders.

Government Support and Ministerial Statements

The project is supported by high-level government officials who recognise its importance for economic growth and daily commuting. Mary Considine, Chief Executive of Iarnród Éireann, stated: "FourNorth is about more than new tracks. It is about building a resilient, high-capacity rail corridor that supports everyday journeys... making space today for the needs of tomorrow." Minister for Transport Darragh O'Brien highlighted ongoing investments in the Northern Line, including passing loops at Mosney, Skerries, Malahide, and Clongriffin. He noted these upgrades will improve journey times alongside the introduction of the new battery-electric DART+ fleet. Seán Canney, Minister of State for Transport, emphasised that improving rail infrastructure is key to unlocking economic growth and improving people's lives, encouraging the public to engage with the upcoming consultation process.