T he project scope was to undertake the installation of a new GSM-R train communications cable and fibre cable to support the fibre network through the Heathrow tunnel fixed to the soffit of the tunnel lining. Limited access and one way in / out made the project very challenging from a planning point of view. With no more than 2.5hrs access each night every single minute counted from accessing at the portal, travelling further into the tunnel each night and travelling back to the portal when works were complete. As the works got closer to the airport end, we were able to off track the Mewps within the tunnel and stable at a safe distance from the track. All fixings were marked out, drilled and pull tested using road rail Mewps and the cables were installed using a combinatio

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