Elizabeth Line Tunnel Ventilation and Controls System Maintenance

Rail for London Infrastructure (RfLI) will issue a Tender for planned maintenance and repairs to the Tunnel Ventilation and Controls System on the Central Section of the Elizabeth Line.

RfLI are responsible for maintenance of the Elizabeth Line. A fundamental element of the RfLI maintenance obligation is maintenance of the Tunnel Ventilation and Controls Systems - critical for the operational railway. The Tunnel Ventilation & Controls System on the Elizabeth Line are a critical part of the railway's infrastructure, designed to ensure safety, comfort, and operational reliability across the 21km of twin-bore tunnels beneath central London.

These systems support both normal environmental management and emergency response, including smoke extraction and safe evacuation. They are fully integrated with fire detection systems and centrally managed through an automated SCADA control platform.

The Elizabeth Line's Tunnel Ventilation & Controls System are vital to the safe and effective functioning of one of the UK's most advanced railway lines. Their robust design, automation, and safety integration ensure continuous protection for passengers and staff, while supporting the operational demands of a modern, high-frequency railway.

Regular and rigorous maintenance is essential to ensure system reliability, safety compliance, and continuity of service in both normal and emergency scenarios

The Rail Industry Supplier Qualification Scheme (RISQS) was utilised to identify the initial supplier longlist. RISQS is a Qualifying Utility Dynamic Market. Through RISQS, 157 potential suppliers were identified within the following RISQS (RICCL) categories:

• D.E.5.1 - Fixed Ventilation Systems / Maintain

• H.L.3.1 - General Building Management / Service

A Market Sounding Questionnaire (MSQ) and Expression of Interest (EOI) were issued to these suppliers on the 12/11/2025. The suppliers who registered interest were invited to PSQ

The MSQ obtained market feedback and supplier appetite, capability and capacity. The results from the findings were used to help shape the procurement strategy. Suppliers who engaged and expressed an interest was invited to participate in the PSQ

Procurement Specific Questionnaire (PSQ) was published on 29/07/2026, Suppliers who participated will be invited to tender stage (ITT)