The Health Safety Executive say they are involved in a joint investigation with North Wales Police into the death of a man at a farm in Llanrug near Caernarfon.
They say they are treating the death as a 'construction incident.'
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Enthusiasts hope to eventually develop the Gwendraeth Valley line as a heritage railway attraction for tourists.
Warren Gatland says there is no danger of his players under-valuing Sunday's Twickenham Test match against RBS 6 Nations champions England.
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