Cildeudy tunnel

Cildeudy tunnel is a tramway tunnel constructed from local stone. It measures approximately 42.5 meters in length and 2.4 meters in width, with the arch intrados reaching about 2.55 meters above the track bed. Each portal features a semicircular arch made of regular ashlar voussoirs, which are 33 centimeters deep and include a prominent drop keystone, rising from hammer-dressed springers. The retaining wall on either side of the northern portal is curved and incorporates refractory brick wasters from Price's brickworks at Tondu, which vary in size, including dimensions of 290 x 85 millimeters, 120 x 350 millimeters, and the largest at 340 x 410 millimeters. One brick is marked with the digits S[3]8, and another with 30. Additionally, the water leet that serves the ironworks runs through the same tunnel, positioned below the level of the rails.