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A train whistle over the Castle Shannon trestle is said to keep nineteenth-century miners alive through several graveyards.

Sound links the rail structure with memory of the dead. The poem does not describe a literal revival or identify individual miners.

'The train whistle / Over the Castle Shannon / Tressle', heard 'through the several / perfect graveyards', is what 'Keeps the nineteen century / miner's alive'.

A local sound carries the memory of past workers; Tressle and miner's are kept as typed.