Railway Viaduct, Red Burn, Castlecary

The Railway Viaduct at Red Burn in Castlecary was designed by Grainger & Miller and completed in 1842. It is an 8-span, segmental-arch railway viaduct built for the Edinburgh and Glasgow Railway, spanning over Red Burn. The structure measures 177.8 meters in length between the east and west abutments and features eight arches, each spanning 15.2 meters. The viaduct is 8.1 meters wide between the parapets, with the highest soffit reaching 26.9 meters above the water.

The piers are made of channelled and stugged ashlar, topped with a projecting, polished ashlar plain entablature. The arches are adorned with raised, channelled, and polished square voussoirs, while the abutments are also channelled and stugged. At rail level, there is a projecting cornice with a simple roll-moulding detail. Above, the parapet is constructed of coursed, broached ashlar with rectangular coping, and there is a 20th-century steel railing along the parapet head.

The large abutment walls on the east and west sides are made of stugged ashlar and feature full-height rectangular pilaster buttresses at the springing point of the arcade. These walls are also crafted from coursed, broached ashlar with rectangular sunken detailing. Additionally, the arches have been reinforced with cast-iron railway sleepers bolted to the north and south abutments, which are tied together along the soffit.