User:MIDI/Drafts/Ashford Tunnel

The Ashford Tunnel is a canal tunnel on the Monmouthshire and Brecon Canal near Talybont-on-Usk in Powys, Wales. The tunnel is 375 yd long.

Construction
The Monmouthshire and Brecon Canal here follows the valley of the River Usk, so in normal circumstances terrain would be followed (as in a contour canal) or traversed by a cutting. It was found, however, on construction of the canal that the ground was not sufficiently stable to have a safe cutting and so a tunnel was built.