Taff Vale Railway bridge over Cwm Clydach

A wide triple-arched slightly skewed railway bridge crossing at S the main road which runs N/S along the W bank of the River Taff, at centre Nant Clydach which flows into the Taff a short distance to E, and at N a lane along the N side of Nant Clydach. Built of coursed rock-faced stone with very deep rock-faced voussoirs, some with diamond-shaped ends, each adjoining a separate stone course; the voussoirs are tooled as quoins on the return inside the arch. Deep and wide plinth. Uneven arches, the river-arch the widest. Some curved rubble abutments to banks. Low parapet of tooled stone with iron railings and 3 rows of wire.

Under all three arches there is a noticeable break between the E and W sides, no doubt representing the track-doubling, though there is no change in masonry style.