ERTMS Deployment for Channel Tunnel Rail Operations

Eurotunnel has launched the first phase of a programme to modernise rail signalling in the Channel Tunnel by introducing the European Rail Traffic Management System (ERTMS). The project focuses on upgrading on-board signalling for the Shuttle locomotive fleet operating between Folkestone in the United Kingdom and Coquelles in France, supporting future interoperability and infrastructure performance.

Context and technical objectives
The Channel Tunnel currently operates with the TVM (Transmission Voie-Machine) signalling system, which is specific to high-speed rail infrastructure in France. To align with European interoperability standards and accommodate new generations of rolling stock, Eurotunnel is transitioning toward ERTMS, the standard adopted across much of the European rail network. ERTMS enables continuous data exchange between trains and trackside systems and incorporates the European Train Control System (ETCS) for speed supervision and train protection.

Scope of the first project phase
The initial phase covers the on-board signalling equipment of 57 Brush locomotives used for LeShuttle services. Compagnie des Signaux – CSEE, part of the MERMEC Group, was selected to supply and integrate a dual-standard ERTMS/TVM solution. This architecture allows locomotives to operate with both signalling systems during the transition period, reducing operational disruption and limiting vehicle downtime.

The dual-standard approach supports a staged migration strategy, ensuring compatibility with existing infrastructure while preparing the fleet for full ETCS operation once ground systems are upgraded.

System architecture and operational impact
The proposed solution is based on a standardised hardware and software platform designed to meet high availability and safety requirements. Continuous train-to-ground communication enables real-time supervision and contributes to improved operational efficiency. By maintaining TVM functionality alongside ERTMS, the system supports uninterrupted Shuttle operations during the migration.

Next steps in the modernisation programme
Following completion of the on-board phase, a subsequent stage will adapt the ground signalling infrastructure to enable full communication with ERTMS-equipped trains. Together, these phases form a structured transition toward European signalling standards, reinforcing safety, interoperability, and long-term sustainability of Channel Tunnel rail operations.

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