Client

Network Rail

Value

£3.9m

Timescale

40 weeks

Location

Tyndrum

The scope of the project is to design and implement the
following works:

  • Installation of longitudinal EKKI deck and OPEPE ballast boards and waterproofing designed to accommodate full LM71 railway live loading in accordance with Eurocodes.
  • Undertake metalwork strengthening to achieve the specified live load capacities of RA8 at 20mph and RA5 at 30mph.
  • Apply new M24 paint system blast cleaned to surface standard Sa2½ satisfy a 25-year service life in a C4 High environment.
  • Condition-led metalwork and concrete substructure repairs designed to maintain the structure capacity at the aforementioned RA ratings.
  • Replacement of existing access ladders to underside inspection walkways at both ends of the structure.
  • Vegetation management of structure and area within 5m envelope.

In order to put passengers first, the works were planned to ensure that the West Highland Line could remain open throughout the project.

During the 9 day blockade, which saw the line closed between Crianlarich and Fort William, the Auch Viaduct team worked day and night in extreme weather conditions to lift the track to replace and waterproof the timber deck underneath.

As part of the agreement with the Auch Estate owners, Story also re-surfaced the access road from the A82 down to the West Highland Way walking route.

No accidents or incidents were reported during the 40-week project.

600m2 
waterproofing

400t
scaffolding

9-day
blockade

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