Opened :1898

Closed : 1964

Engineering code : CTD

Length: 1867 yds

The Wenvoe Tunnel is one of the longest rail tunnels in South Wales being just over one mile long. This twin track tunnel was started in 1888, and full rail services began in 1898. The tunnel is brick lined except for the southernmost 300 yards, where the walls are rough stone.This marks a change in the geology from loosed material to solid limestone. As the tunnel is cut mainly through limestone, there is considerable calcite buildup on the walls.The tunnel now carries a 1m guage water main and a stream. A 'tidemark' on the walls about 4 feet up would indicate that the tunnel can flood after heavy rains. The tunnel is completely straight and has a constant gradient, dipping gently to the north. The northern approach cutting is partially flooded and is private. The northen portal is fenced off cueerently. There is a single air-shaft half way along. This has been used as a dumping ground and there is a large pile of waste directly below the shaft. The southern portal is fenced across, although the southern approach cutting is flooded and hard to access. The walkthrough runs from south to north and was compiled from 3 visits during 2005. There was access during 2005 but the fence appears to have been repaired during 2006.