Garndiffaith Railway Viaduct is a Grade II listed building in the Torfaen local planning authority area, Wales. First listed on 16 November 1990. Railway viaduct.

Garndiffaith Railway Viaduct

WRENN ID
former-loggia-wren
Grade
II
Local Planning Authority
Torfaen
Constituency
Torfaen MP: Nick Thomas-Symonds (Lab)
Country
Wales
Date first listed
16 November 1990
Type
Railway viaduct
Address
Garndiffaith Railway Viaduct, Pontypool, Abersychan
OS grid reference
SO 262 043
Coordinates
51.7327, -3.06912
Source
Cadw listing

Also on this page: flood risk · radon risk · weather exposure · detailed attributes ↓

Description

The Garndiffaith Railway Viaduct is an originally twin track railway structure built between 1876 and 1877. It features snecked rubble construction with ashlar impost bands and a vermiculated stringcourse above its arches, which are made of blue brick voussoirs and soffits, supported by stone piers. The viaduct has nine semi-circular arches, each 50 feet wide, arranged in three equal sections of three arches, with corbelled refuges on every third pier. It follows a gentle curve and narrows towards the east end. A chamfered ashlar plaque on the pier by Viaduct Road indicates its construction by engineer John Gardner. The viaduct has been repurposed as a cycle track and footpath, with fences on either side, and is beginning to be covered with vegetation.

Local climate

Garndiffaith Railway Viaduct sits in a wetter-than-average part of the UK, with an average of 1,020 mm of rain a year. This makes it wetter than 81% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 75% of listed buildings.

It experiences an average of 43 freeze-thaw cycles a year, more than 81% of listed buildings. Of these, 20 follow at least 1 mm of rain in the preceding 48 hours. Average temperatures at this location have risen by 0.3°C per decade since 1991.

Averages for 1991–2020; temperature trend 1991–2025. Figures describe the wider area (a grid cell of roughly 10 km), not the individual site. Contains modified Copernicus Climate Change Service information 2026.

More on this building

Sign in or create a free account to unlock:

  • No EPC on record for this property
  • No sale records on file
  • No related consent applications matched
  • Detailed attributes — period, style, materials, features
  • Flood risk assessment
  • Radon risk assessment
  • Weather exposure and heating demand — rain and frost month by month and year by year, wind direction, solar and humidity
Create free account

Matched applications, energy data and sale records are assembled automatically and may contain errors. Flag incorrect data.

Similar buildings

The closest matches to this building from all 493,000 UK listed buildings, by architecture, period and materials.

See all similar buildings →

this building   1 similar   nearby listed buildings

Nearby listed buildings

  1. Church of St Thomas Grade II 282 m
  2. Former Goods Shed of Abersychan and Talywain Station Grade II 564 m
  3. Waterloo Cottage Grade II 695 m
  4. British Colliery Pumping Engine House Grade II 793 m
  5. Rising Sun Bridge Grade II 817 m
  6. Lasgarn Cottage Grade II 841 m
  7. The Big Arch Grade II 863 m
  8. High Street Baptist Church Grade II 864 m
  9. Former British Ironworks office and foundry quadrangle Grade II* 876 m
  10. Former colliery engine house at ETM Steel Fabrication Grade II 954 m