Cefn Railway Viaduct (part in Vaynor Community) is a Grade II* listed building in the Merthyr Tydfil local planning authority area, Wales. First listed on 11 July 1951. House.

Cefn Railway Viaduct (part in Vaynor Community)

WRENN ID
south-quartz-russet
Grade
II*
Local Planning Authority
Merthyr Tydfil
Constituency
Merthyr Tydfil and Aberdare MP: Gerald Jones (Lab)
Country
Wales
Date first listed
11 July 1951
Type
House
Address
Cefn Railway Viaduct (part in Vaynor Community), Cefn Coed-Y-Cymmer
OS grid reference
SO 030 077
Coordinates
51.76042, -3.40629
Source
Cadw listing

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

Description

Cefn Railway Viaduct is a railway viaduct built in 1866. It features abutments, tall slender piers, and parapets made of coursed irregular sized rock-faced limestone blocks. The structure includes fifteen ring-built semi-circular brick arches, each consisting of six courses. The piers have a projecting impost band, and there are two projecting string courses located below the parapets. The viaduct is constructed on a gentle arc, measuring approximately 235 meters in length and reaching a maximum height of about 36 meters. An inscription on the south side reads, "Built by Savin and Ward 1866."

Local climate

Cefn Railway Viaduct (part in Vaynor 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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