Aberdulais Viaduct (partly in Tonna community) is a Grade II listed building in the Neath Port Talbot local planning authority area, Wales. First listed on 26 November 2003. Railway viaduct.

Aberdulais Viaduct (partly in Tonna community)

WRENN ID
dusk-parapet-hyssop
Grade
II
Local Planning Authority
Neath Port Talbot
Constituency
Neath and Swansea East MP: Carolyn Harris (Lab)
Country
Wales
Date first listed
26 November 2003
Type
Railway viaduct
Address
Aberdulais Viaduct (partly in Tonna community), Blaenhonddan
OS grid reference
SS 773 992
Coordinates
51.6787, -3.77586
Source
Cadw listing

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

Description

The Aberdulais Viaduct is a railway viaduct featuring five bays, four of which span the River Neath, while the fifth bay on the west side crosses Station Road. The abutments date back to the original bridge, which was opened in 1851, and are constructed from coursed hammer-dressed sandstone. The later arches and parapet are made of snecked, rock-faced stone with blue-brick arches. The piers are designed with V-shaped cutwaters topped with pyramidal caps. A thick projecting blue-brick band runs beneath the parapet, and the flat coping is made of large bricks. The abutments have a battered design, featuring a concave profile beneath the deck, and they splay outwards to support an embankment. Additionally, the abutments retain vertical slots that once housed the original timberwork of Brunel's bridge. The deck of the viaduct carries a single track.

Local climate

Aberdulais Viaduct (partly in Tonna community) sits in one of the wettest parts of the UK, with an average of 1,380 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 96% of listed buildings.

It experiences an average of 28 freeze-thaw cycles a year, fewer than 69% 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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