Railway Viaduct is a Grade II listed building in the Caerphilly local planning authority area, Wales. First listed on 15 July 1993. Viaduct.

Railway Viaduct

WRENN ID
twisted-grate-merlin
Grade
II
Local Planning Authority
Caerphilly
Constituency
Blaenau Gwent and Rhymney MP: Nick Smith (Lab)
Country
Wales
Date first listed
15 July 1993
Type
Viaduct
Address
Railway Viaduct, Pontlottyn, Rhymney
OS grid reference
SO 116 062
Coordinates
51.74834, -3.281
Source
Cadw listing

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

Description

This is a 10-arch, single track railway viaduct constructed from snecked rock-faced rubble, featuring some tooling, particularly on the interiors of the arches. The viaduct has round-headed arches with voussoirs and a double bandcourse at the parapet level. An impost course runs along the inner face of the arches, and there is flat rock-faced coping on the parapet. The ends of the viaduct have sloping buttresses that are ramped and splayed outwards. Additional buttresses have been added to the east side, along with iron braces. There are also cast iron downpipes located between each arch on the west side.

Local climate

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.

More on this building

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