Of course there's graffiti in there. This was, apparently, used as a stable!
Further to improve the ventilation provided by the two vertical shafts, in 1950 an old shaft leading out to the face of the gorge was re-opened after having been blocked for many years. Originally it had been used as a stable for ponies employed in tunnel construction. A ganger's cabin is hewn out of the side of the tunnel and is on the down side approximately midway.
— Colin Maggs, The Bristol Port Railway & Pier and the Clifton Extension Railway, The Oakwood Press, 1975
GPS Coordinates:
51.46866, -2.63476
Location: Sneyd Park and the Downs