Forte Engineering has been appointed by Network Rail (High Speed) Ltd (NRHS) as the Principal Contractor to lead the renewal of Tunnel Ventilation (TV) assets on the London St. Pancras Highspeed route.

NRHS, contracted by London St. Pancras Highspeed, is responsible for the operation, maintenance, and renewal of the London St. Pancras Highspeed railway infrastructure, including three key stations: St Pancras International, Stratford International, and Ebbsfleet International. London St. Pancras Highspeed – formerly known as the Channel Tunnel Rail Link – is the UK’s only high-speed railway, forming part of the Trans-European Network System (TENS). It provides vital passenger and freight links between London and continental Europe via the Channel Tunnel, serving destinations such as Paris and Brussels, as well as delivering high-speed domestic services between London and Kent.

The tunnel ventilation systems located within Section 2 of the route are critical to ensuring safe operations during emergencies, periods of congestion, and scheduled maintenance. These systems comprise key components including fans, dampers, attenuators, power supplies, and control systems.

Forte Engineering’s scope of works includes the replacement of key infrastructure elements that are reaching the end of their operational life:
• 10 variable speed drives that control the fan motors within the tunnel ventilation system
• 4 power quality filters in the Thames Tunnel to manage electrical disturbances associated with the drives and fans

Originally installed in 2008, these assets are becoming obsolete, with limited availability of spare parts. The renewal project will:
• Significantly reduce operational and safety risks associated with drive failure
• Enhance the overall reliability and resilience of the tunnel ventilation systems
• Mitigate risks related to obsolescence and long-term maintainability

Derek Riddell, Managing Director of Forte Engineering, commented:
“We’re proud to be working with NRHS on such an important infrastructure renewal project. Our expertise in mechanical & electrical engineering for the rail sector, combined with our commitment to environmental and sustainable practices, ensures we can deliver a high-quality solution. This project will not only benefit NRHS through improved operational efficiency but will also enhance safety and reliability for passengers.”

Works are scheduled to begin in Summer 2025, with completion expected by Autumn 2027.