Cildeudy tunnel is a Grade II listed building in the Bridgend local planning authority area, Wales. First listed on 23 October 1998. Tunnel.
Cildeudy tunnel
- WRENN ID
- vast-panel-ivy
- Grade
- II
- Local Planning Authority
- Bridgend
- Constituency
- Bridgend MP: Chris Elmore (Lab)
- Country
- Wales
- Date first listed
- 23 October 1998
- Type
- Tunnel
- Address
- Cildeudy tunnel, Goetre-Hen, Llangynwyd Lower
- OS grid reference
- SS 889 853
- Coordinates
- 51.55626, -3.60299
- Source
- Cadw listing
Description
Cildeudy tunnel is a tramway tunnel constructed from local stone. It measures approximately 42.5 meters in length and 2.4 meters in width, with the arch intrados reaching about 2.55 meters above the track bed. Each portal features a semicircular arch made of regular ashlar voussoirs, which are 33 centimeters deep and include a prominent drop keystone, rising from hammer-dressed springers. The retaining wall on either side of the northern portal is curved and incorporates refractory brick wasters from Price's brickworks at Tondu, which vary in size, including dimensions of 290 x 85 millimeters, 120 x 350 millimeters, and the largest at 340 x 410 millimeters. One brick is marked with the digits S[3]8, and another with 30. Additionally, the water leet that serves the ironworks runs through the same tunnel, positioned below the level of the rails.
Local climate
Cildeudy tunnel sits in one of the wettest parts of the UK, with an average of 1,200 mm of rain a year. This makes it wetter than 91% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 93% of listed buildings.
It experiences an average of 29 freeze-thaw cycles a year, fewer than 68% of listed buildings. Of these, 12 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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- 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
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Nearby listed buildings
- Abutments to overbridge/ loading bay on the former Duffryn Llynvi and Porthcawl Railway
- Nicholls Arms PH
- North portal and wings of the Rock-fawr Bridge on Sir Robert Price's private tramway.
- Walls flanking the inclined plane joining the Bettws tramway to the DLP Railway.
- 23 Derllwyn Road
- Former Truck Shop Tondu Ironworks now Foxtroy Residential Home
- Park Cottage
- Park House
- Calcining Kilns and attached abutment at Tondu Ironworks
- Lift Tower at Tondu Ironworks