Quakers Yard Railway Viaduct is a Grade II* listed building in the Merthyr Tydfil local planning authority area, Wales. First listed on 4 January 1988. Railway viaduct.
Quakers Yard Railway Viaduct
- WRENN ID
- standing-string-sage
- Grade
- II*
- Local Planning Authority
- Merthyr Tydfil
- Constituency
- Merthyr Tydfil and Aberdare MP: Gerald Jones (Lab)
- Country
- Wales
- Date first listed
- 4 January 1988
- Type
- Railway viaduct
- Address
- Quakers Yard Railway Viaduct, Treharris
- OS grid reference
- ST 088 964
- Coordinates
- 51.65963, -3.31912
- Source
- Cadw listing
Description
The Quakers Yard Railway Viaduct is a Grade II* listed railway viaduct that spans the Afon Taf. This very tall, slightly curving structure features six arches and is the original viaduct located upstream, visible only from the north. It is constructed of massive rock-faced squared masonry and has highly modeled octagonal piers. The rock-facing is tooled at the edges and is banded three times with broad three-course bands of tooled masonry, while the capitals consist of six stepped courses of rock-faced stone.
The arches are remarkable, with deeply splayed edges, and the splays are made of tooled stone, as are the arch soffits. The spandrels are also finished in rock-faced stone, and there is a prominent coved string course in tooled stone, along with rock-faced stone parapets that feature ashlar copings. The ends of the abutments are splayed out.
An addition to the viaduct is simpler in design, featuring regular piers and caps in two courses. The arches of this addition have rock-faced stone voussoirs and vermiculated keystones, with the coved string course breaking forward over the keystones.
Local climate
Quakers Yard Railway Viaduct sits in a wetter-than-average part of the UK, with an average of 1,160 mm of rain a year. This makes it wetter than 89% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 83% of listed buildings.
It experiences an average of 43 freeze-thaw cycles a year, more than 85% of listed buildings. Of these, 22 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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