Cildeudy tunnel

The tramway tunnel is built of local stone, and is approximately 42.5m long and 2.4m wide, the arch intrados reaching approximately 2.55m above the track bed. Each portal consists of a semicircular arch of regular ashlar voussoirs, 33cm deep with an emphasised drop keystone, and rises from hammer-dressed springers. The retaining wall either side of the N portal is curved and includes refactory brick wasters from Price's brickworks at Tondu, of irregular sizes, including 290 x 85mm, 120 x 350mm and the largest at 340 x 410mm. One is impressed with the digits S[3]8, another 30. The water leet serving the ironworks, which elsewhere runs parallel to the tramway, is conducted through the same tunnel below the level of the rails.