Aberdulais Viaduct (partly in Tonna community)

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.