Pandy Mawr Railway Arch is a Grade II listed building in the Caerphilly local planning authority area, Wales. First listed on 9 January 1989. Arch.

Pandy Mawr Railway Arch

WRENN ID
guardian-stair-scarlet
Grade
II
Local Planning Authority
Caerphilly
Constituency
Caerphilly MP: Chris Evans (Lab)
Country
Wales
Date first listed
9 January 1989
Type
Arch
Address
Pandy Mawr Railway Arch, Bedwas, Trethomas and Machen
OS grid reference
ST 161 894
Coordinates
51.59791, -3.21238
Source
Cadw listing

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

Description

Pandy Mawr Railway Arch is a single, long, narrow arch designed for roadway use, supporting former railway embankments that rise high above. It features round-headed arch rings at each portal, constructed with rock-faced masonry voussoirs and keystones. The spandrels are finished with snecked facings, and there are flanking raking buttresses topped with flat stone copings. The long interior is made of continuous snecked masonry. The wide embankments at various levels once carried tramroad and railway lines through the Rhymney Valley.

Local climate

Pandy Mawr Railway Arch sits in a wetter-than-average part of the UK, with an average of 1,060 mm of rain a year. This makes it wetter than 85% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 81% of listed buildings.

It experiences an average of 32 freeze-thaw cycles a year, fewer than 59% of listed buildings. Of these, 13 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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  • Weather exposure and heating demand — rain and frost month by month and year by year, wind direction, solar and humidity
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