Opened :?

Closed : ?

Engineering code : MTA

Length: Clydach Down: xxxyds, Clydach Up xxxyds, Gelli-felen Down xxx yds, Gelli-felen Up xxx yds

The Merthyr, Tredegar and Abergavenny Railway company Faced a number of engineering difficulties along its route. Although the route through the Clydach Vale mainly followed the earlier Bailey's Tramroad, some of the bends were too tight, necessitating the construction of tunnels at Clydach and Gelli-felen. Originally single tunnels were dug. Parallel tunnels were dug in 1877 when the line was doubled. The original tunnels bacame the Up line, and the new line the Down line. The northerly tunnels were the first to be built, followed by the southerly tunnels.

Clydach Down Tunnel

Clydach Up Tunnel

Gelli-felen Down Tunnel

Gelli-felen Up Tunnel