Railway Bridge over Graig-yr-Hesg Road, including integral stone drainage channel

A single-span railway bridge in 5 phases. On the outer downhill (E) side is an keyed elliptical arch in rock-faced stone, with impost band and a band below the parapet, which has plain copings. Splayed abutment walls retaining the embankment have rock-faced copings and terminate in square piers. On the outer uphill side is a plate girder span, probably the latest of the phases, with an added projecting concrete footway. The battered abutments have short rectangular piers at the ends of the parapet. The abutment on the S side clearly belongs to the original phase of the bridge and is of rock-faced stone, but has been heightened in rubble stone. The abutment on the N side is of rubble stone and abuts the original phase of the bridge.

The plate-girder span is supported by a crude tapering stone pier with V-shaped ends. The earliest phase of the bridge is immediately downhill of this. It has rock-faced abutments, impost bands and hammer-dressed stone soffit in typical Brunel style. The second phase, added c1861, abuts it on the downhill side and has similar detail but is narrower. Next downhill is a narrow plate girder span, followed by the easternmost outer span, which was built to accommodate a double track and has a white-brick soffit.

The drainage channel is built close to the S abutments, and comprises a watercourse with a U-shaped profile, of coursed hammer-dressed stone. The water flows into a culvert on the E side of the bridge.