History

The Hengoed Viaduct was built as part of the Newport, Abergavenny and Hereford (Taff Vale Extension) Railway. The engineer was Charles Liddell. It was a standard gauge line linking Pontypool with the Taff Vale Railway at Quakers Yard, but was proposed as part of a strategic lateral route to Swansea. The railway was begun in 1847, was completed as far as Quakers Yard in 1858, and Swansea in 1864. The line was taken over by the GWR in 1865 and was rich in both passenger and freight traffic. It was closed over 100 years later in 1964.

The cross-valley line required substantial engineering works: 3 viaducts, 4 tunnels, embankments and steep gradients, all constructed under the railway engineer, Charles Liddell. The cast iron Crumlin Viaduct was a structure of major significance, but only the abutments survive. The engineer's drawing for the Hengoed Viaduct is dated 1857 and it was built by Messrs Rennie & Logan at a cost of £20,000. It was designed to be 130 feet (39.6 metres) high and it was more traditional in style than the Crumlin Viaduct using stone from the nearby Trecelyn quarries and local bricks. The smaller arch at the east end passed over the Brecon & Merthyr Railway.

Exterior

High 16-arch viaduct, slightly curved in plan. Constructed of rock-faced, snecked Pennant sandstone. High round arches on imposts with large voussoirs. Soffits partly of red brick. Narrow, slightly splayed piers. String course and shallow parapets with coping stones, some upright. Square piers to ends and flanking smaller E arch which is skewed.

Reasons for Listing

Listed grade II* as a major monument of railway engineering on a strategic lateral route, in use for over 100 years and one of the oldest surviving viaducts of its type. Group value with the Woollen Mill which stands beneath.

External Links

• Cadwr Listing

External links are from the relevant listing authority and, where applicable, Wikidata. Wikidata IDs may be related buildings as well as this specific building. If you want to add or update a link, you will need to do so by editing the Wikidata entry.

Recommended Books

• 
  Cork: City and County (Pevsner Architectural Guides: Buildings of Ireland)
• 
  The Listed Buildings and Other Principal Structures at the Royal Gunpowder Mills Waltham Abbey
• 
  Bedfordshire, Huntingdonshire, and Peterborough (Pevsner Architectural Guides): Written by Charles O'Brien, 2014 Edition, Publisher: Yale University Press [Hardcover]
• 
  Listed Buildings, Conservation Areas and Monuments
• 
  Period Property Manual (New Ed)
• 
  [(Cumberland and Westmorland)] [By (author) Nikolaus Pevsner] published on (January, 1967)