Twerton Tunnel: East Entrance (Adjoining Carr'S Wood)

The Twerton Tunnel's east entrance, located on the south side of Lower Bristol Road and adjoining Carr's Wood, is a railway tunnel entrance built around 1840 by Isambard Kingdom Brunel. It features Lias walling with ashlar dressings in a Tudor style. The entrance has a single four-centred arch with a dressed flush face, flanked by octagonal turrets. The turret on the north side is complete, with a cross arrow-loop and a crenellated top, supported by a short wall that angles away from the track alignment. The left turret projects forward but is designed as a wall parallel to the tunnel front rather than a returning turret, and it is also crenellated. The main horizontal parapet has a saddle-back coping, with a weathered string course running across the full width of the entrance. The lower parts of the walls flare out.

On the south side of the entrance, there is a retaining wall approximately 60 meters long, made of coursed stonework with an engineering brick capping. This wall features a long section that rises to a flat gable, all supported by a stepped corbel-table, with the lower half of the wall flaring out. At the east end, the wall terminates at a large plain square pier topped with a flat capping and a triple frieze-band. This entrance is part of the Great Western Railway development between Bath and Bristol, which was opened to traffic on August 21, 1840. The tunnel itself is 111 feet long and is known as No. 6 Tunnel by the railways.