Last update 8 June 2026
Mileages are given in the form miles.chains unless stated otherwise. Figures prefixed with ≈ are approximate, those in parentheses are not on this route but are given for reference. Reference to 'start'/'end' of an asset are as read down the page.
5.55 Penrhos Junction with CTD 8.30 Pentyrch 9.42 Walnut Tree West 9.46 start of Walnut Tree viaduct 9.69 end of Walnut Tree viaduct 11.66 Penrhos Lower Junction with PEZ 12.30 Penrhos viaduct 12.71 Gwaun Gledyr 13.56 Penyrheol viaduct 14.33 Energlyn North Junction with ENZ (9.79) 14.54 Pwll-Y-Pant viaduct 15.40 Duffryn Isaf Junction with BJR (9.38)