Former Hall's tramroad and railway tunnel W portal is a Grade II listed building in the Caerphilly local planning authority area, Wales. First listed on 17 March 1999. Tunnel portal.

Former Hall's tramroad and railway tunnel W portal

WRENN ID
muted-rampart-primrose
Grade
II
Local Planning Authority
Caerphilly
Constituency
Newport West and Islwyn MP: Ruth Jones (Lab)
Country
Wales
Date first listed
17 March 1999
Type
Tunnel portal
Address
Former Hall's tramroad and railway tunnel W portal, Pentwyn-Mawr, Newbridge
OS grid reference
ST 195 963
Coordinates
51.6601, -3.16405
Source
Cadw listing

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

Description

The former Hall's tramroad and railway tunnel west portal is constructed from snecked rockfaced stone, topped with flat stone coping. The entrance features a round arch made up of three courses of red and blue brick headers, with tooled arises on the jambs.

Local climate

Former Hall's tramroad and railway tunnel W portal sits in a wetter-than-average part of the UK, with an average of 1,090 mm of rain a year. This makes it wetter than 87% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 79% of listed buildings.

It experiences an average of 44 freeze-thaw cycles a year, more than 85% of listed buildings. Of these, 21 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.

More on this building

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  • No sale records on file
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  • 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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