Disused Railway Tunnel Made Safe When a disused Victorian-era railway tunnel in Scotland was shown to be degrading, threatening the roads above, the structure needed to be made safe. A key element of the challenging inll solution was provided by an advanced hydrocarbon and chemical resistant barrier. The St Margaret’s Head Tunnel was originally part of the Dunfermline to North Queensferry railway line and lies under the northern approach to the Forth Road Bridge. Amey, the Forth Bridges Operating Company, determined that preventative measures needed to be taken to ensure the tunnel’s structural integrity. The tunnel, which is 420m long, 4.3m wide and 5.1m high, had been sealed o, with only two vertical shafts at either end for access points. The Amey engineers decided the best solution w

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