Cefn Railway Viaduct (part in Cyfarthfa Community) is a Grade II* listed building in the Merthyr Tydfil local planning authority area, Wales. First listed on 19 December 2002. A Not explicitly stated Viaduct.

Cefn Railway Viaduct (part in Cyfarthfa Community)

WRENN ID
salt-passage-ochre
Grade
II*
Local Planning Authority
Merthyr Tydfil
Constituency
Merthyr Tydfil and Aberdare MP: Gerald Jones (Lab)
Country
Wales
Date first listed
19 December 2002
Type
Viaduct
Period
Not explicitly stated
Address
Cefn Railway Viaduct (part in Cyfarthfa Community), Cefn Coed-Y-Cymmer
OS grid reference
SO 030 076
Coordinates
51.7587, -3.40621
Source
Cadw listing

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

Description

The Cefn Railway Viaduct is a significant railway structure built in 1866. It features abutments, tall slender piers, and parapets made of coursed, irregularly sized, rock-faced limestone blocks. The viaduct is supported by fifteen semi-circular brick arches, each constructed with six courses. The piers have a projecting impost band, and there are two projecting string courses located below the parapets. The viaduct spans approximately 235 meters in length and has a maximum height of around 36 meters. An inscription on the south side notes its builders, Savin and Ward.

Local climate

Cefn Railway Viaduct (part in Cyfarthfa Community) sits in one of the wettest parts of the UK, with an average of 1,270 mm of rain a year. This makes it wetter than 94% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 85% of listed buildings.

It experiences an average of 54 freeze-thaw cycles a year, more than 94% of listed buildings. Of these, 30 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.

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