First arch over South Wales Railway at Peniel Green is a Grade II listed building in the Swansea local planning authority area, Wales. First listed on 16 January 2004. Railway arch.

First arch over South Wales Railway at Peniel Green

WRENN ID
watchful-wicket-hyssop
Grade
II
Local Planning Authority
Swansea
Constituency
Neath and Swansea East MP: Carolyn Harris (Lab)
Country
Wales
Date first listed
16 January 2004
Type
Railway arch
Address
First arch over South Wales Railway at Peniel Green, Llansamlet
OS grid reference
SS 700 975
Coordinates
51.66135, -3.87965
Source
Cadw listing

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

Description

The first arch over the South Wales Railway at Peniel Green is one of four broad stone arches made of rubble stone, featuring cut stone voussoirs that form segmental arches. Each arch is about 12 meters wide and approximately 20 to 25 meters long. The arches are topped with copper slag and have inner retaining walls on each side to hold back earth.

Local climate

First arch over South Wales Railway at Peniel Green sits in one of the wettest parts of the UK, with an average of 1,400 mm of rain a year. This makes it wetter than 97% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 97% of listed buildings.

It experiences an average of 21 freeze-thaw cycles a year, fewer than 78% of listed buildings. Of these, 8 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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  • 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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  2. Third arch over South Wales Railway at Peniel Green Grade II 142 m
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