TOP:  The Torpantau Tunnel - Date unknown Brian Mills. Torpantau Tunnel is 666 yards in length and features a masonry arch springing either off shelves cut high into the rock face or lengths of brick or stone sidewall which were added incrementally over time as the need arose. Refuges are incorporated throughout. The south portal is masonry-built and wedged into the end of a vertically-sided cutting, the west face of which is retained by a wing wall for a short distance. The north portal (actually East Southeast facing) is a larger stone structure, projecting out into the cutting which has more gently graded sides. Though generally in reasonable condition, some small falls of loose rock have occurred, accumulating on the solum, and a stream flows through the tunnel resulting in both approach cuttings being waterlogged. The Brecon Mountain Railway has occupied the trackbed south of Torpantau since 1980 and asserts the long-term aspiration of extending its operation northwards through the tunnel.
 
BOTTOM:  A recent photo of the Southeast portal of the Torpantau Tunnel - Date unknown Brian Mills.