Tri-Mode Rolling Stock Integration for Cross-Border Rail Infrastructure

Iarnród Éireann (IÉ) and Translink NI Railways (NIR) have entered a cooperation with Stadler to develop and maintain eight FLIRT Intercity (IC) trainsets. The project introduces tri-mode propulsion technology to the 180-kilometre cross-border corridor to replace aging rolling stock by 2030.

Context of the Cooperation
The Enterprise rail service, linking the capitals of Dublin and Belfast, faces rising passenger demand and the approaching end of the current fleet’s operational life. To address these challenges, IÉ and NIR required a solution capable of navigating disparate power systems and non-electrified sections. Stadler was selected to provide specialized rolling stock and a 15-year comprehensive maintenance support package, including technical supervision and engineering services to ensure fleet availability.

Technical Solution and Power Integration
The 200-metre-long FLIRT IC trainsets utilize a modular tri-mode propulsion system designed for seamless transition between power sources:

Future-proofing measures allow the fleet to transition toward dual electric-battery operation. The architecture supports a 1500 V DC traction system for the southern section and a 25 kV AC system for the northern section as electrification infrastructure expands. This technical flexibility aligns with the net-zero strategies of both jurisdictions.

Deployment and Maintenance Framework
The implementation involves a £548 million (€698 million) investment supported by the PEACEPLUS programme. Stadler’s role extends beyond manufacturing to include a 15-year maintenance contract.

This agreement covers:

Integration with existing infrastructure requires the 407-seat vessels to feature step-free access and barrier-free interior designs, standardized for cross-border compatibility.

Operational Impact and Use Cases
The deployment aims to reduce journey times between Dublin and Belfast to under two hours. Technically, the increased efficiency and reliability of the tri-mode system enable an expansion of service frequency, moving from current levels to 16 daily services in each direction.

By utilizing battery and electric drives where infrastructure permits, the cooperation reduces carbon intensity per passenger kilometre. The transition between power modes is managed by onboard control systems without requiring stops or manual intervention, maintaining process stability and operational continuity across the two distinct rail networks.

Edited by Evgeny Churilov, Induportals Media - Adapted by AI.

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