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The Headstone Viaduct, built by the Midland Railway, over the River Wye, immediately after the 533-yard Headstone Tunnel, travelling north from Great Longstone. The viaduct, usually incorrectly called Monsal Dale Viaduct, is 300 feet (91 m) long, with five 50-foot span arches, some forty feet high at the centre. Initially, some slippage occurred, and remedial work was carried out in 1907-8