Tender: Retrofit Passive Thermal Management for Legacy Lineside Signalling Housings – Southern Region (Location Cases)

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Network Rail is seeking passive thermal management solutions that can be retrofitted to existing legacy lineside signalling and telecoms equipment housings (Location Cases) in the Southern Region, including Kent. The tender addresses housings dating from the 1960s–2000s that were not designed for elevated ambient temperatures or prolonged thermal loads and are increasingly at risk of overheating, which can degrade equipment reliability and lifespan. Proposed solutions must be passive — active cooling is not desirable due to power constraints, maintenance burden and whole-life cost implications — and must be installable without compromising housing security, structural integrity or existing cable penetrations. In Kent there are over 5,000 Location Cases, in the Southern Region over 15,000, and nationally more than 60,000.