Diesel trains passing through can also contribute to the warming effect. Read the biggest stories in Wales first by signing up to our daily newsletter here The Ffestiniog Tunnel, located in an ...
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Strange 'dragons' breath' coming from Eryri hills like 'phantoms passing underneath'Diesel trains passing through can also contribute to the warming effect. In an area of heavy rainfall, the unlined Ffestiniog Tunnel has been plagued by water ingress, rockfalls and landslides ...
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