Wales & Western

Severn Tunnel OLE Blockade

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The Project

As part of the wider scheme to electrify the Great Western Route (GWR) between London Paddington and Cardiff, AmcoGiffen were contracted to provide the installation of all Overhead Line Equipment (OLE) in the tunnels from Bristol Patchway to Cardiff.Covering 33 miles of route, 5 stations, 7 tunnels and 4 viaducts, we successfully delivered all enabling and installation works, utilising the Rigid Overhead Conductor Rail System (ROCS), manufactured by Furrer & Frey.

Scope of works

With the overhead line equipment blockade taking place over a concentrated, 6-week period, the work was equivalent to five years of rules of the route access to the tunnels.

Our overall scope of works included:

  • All prior enabling works
  • Collaboration with tunnel maintainers to identify and clear over 2000m2 of soot from the tunnel brickwork
  • Drilling and fixing over 5000 anchors
  • Installation of 1700 drop tubes and registration arms
  • Installation of conductor rail, including 14km
  • of contact wire and 14km of Auto-Transformer Feeder (ATF) cable
  • Post-fix testing and handback to client