Nant Dyar Railway Viaduct

Cadw's description

Location

Located some I km SW of Clydach village. Viaduct carries public footpath leading from Clydach - Waunllapria by-road, past former railway station.

History

Built 1862 and widened 1877, forming part of the Merthyr, Tredegar and Abergavenny Railway. The Engineer was John Gardner (1821-1894), who has engineered the Staines and Wokingham Railway, and also the Nantwich and Market Drayton Railway, as well as having doubled the line between Abergavenny and Brynmawr. The company was set up in 1859, consisting largely of ironmasters including Crawshay Bailey of Nantyglo, Thomas Brown of Ebbw Vale and James Hill of Blaenavon. A local director was John Jayne of Pant-y-beiliau. First sod cut at Abergavenny on 18th June 1860 by Mrs Crawshay Bailey. By August 1860, 8 bridges were under construction, as well as the tunnels at Gellifelen. By 1861, the company was overdrawn, due to the high engineering costs. The London and North Western Railway took a 1000 year lease of the company, confirmed by Act in August 1862, by which time the line was operating from Abergavenny to Brynmawr. Brynmawr-Nantybwch section finished by March 1864. The rest of the line to the west was completed by 1879. In 1877 the line was doubled.

Exterior

Eight arch viaduct over steep gorge of the Nant Dyar. Line of viaduct gently curves, the length being 312 feet (95 metres), the height 75 feet (23 metres). Rock-faced limestone construction, blue Staffordshire brick arch rings of four header courses, each arch being 30 feet (9 metres) wide. Low parapet above rock-faced stringcourse.

Reason for designation

Listed as a major survival of later C19 railway engineering, the railway being important to the iron and coal industry of the eastern valleys of Wales. The viaduct is a prominent survival of the important industrial landscape of the Clydach Gorge.