List of Tunnels in The United Kingdom - Wales


County Tunnel Type Length (Metres) Length (Imperial) Construction method / Notes Date of opening
Bridgend Nottage, Porthcawl Railway 58 63 yd Single track. Short, south portal relandscaped. 1829?
Caerphilly Pennar Tunnel Railway 219 239 yd On Halls Road Branch between Risca and Markham
Caerphilly Glyn Tunnel, Hafodyrynys Railway 260 280 yd Taff Vale Extension. Single track. Closed 1964. 1857
Caerphilly Caerphilly Tunnel Railway 1,768 1933 yd In use between Thornhill, Cardiff and Caerphilly. On the Rhymney Railway 1871
Cardiff Queensgate Tunnel Road 715 782 yd Part of the A4232 Butetown link road 1995
Carmarthenshire Pencader Tunnel Railway 818 895 yd Built for broad gauge 1861
Gwynedd Conwy Road Tunnel Road 1,080 1,180 Carries the A55 road around Conwy 1991
Gwynedd Penmaenbach Westbound Tunnel Road 658 720 Carries the Westbound A55 road through the Penmaenbach headland 1989
Gwynedd Penmaenbach Eastbound Headland Tunnel Road 172 188 Carries the Eastbound A55 road through the Penmaenbach headland 1932
Gwynedd Pen-y-Clip Westbound Tunnel Road 930 1,020 Carries the Westbound A55 road through the Pen-y-Clip headland 1994
Gwynedd Penhelig Tunnels (Aberdovey No. 1, Frongoch) Railway 180 200 yd One of four tunnels on the Cambrian Coast Railway. 1867
Gwynedd Penhelig Tunnels (Aberdovey No. 2, Morga Bach) Railway 200 219 yd One of four tunnels on the Cambrian Coast Railway. 1867
Gwynedd Penhelig Tunnels (Aberdovey No. 3) Railway 175 191 yd One of four tunnels on the Cambrian Coast Railway. 1867
Gwynedd Penhelig Tunnels (Aberdovey No. 4, Craig-y-Don) Railway 487 533 yd One of four tunnels on the Cambrian Coast Railway. 1867
Gwynedd Ffestiniog Tunnel Railway 3,407 3726 yd UK's longest single-track tunnel, in use on the Conwy Valley Line
Monmouthshire Severn Tunnel Railway 7,012 4 miles, 628 yards Longest mainline tunnel in UK until Channel Tunnel opened 1886
Monmouthshire Gibraltar Tunnel Road 185 202 yd Twin bore on A40 dual carriageway 1968
Monmouthshire Bryn Tunnel, Hengoed Railway 364 398 On Newport, Abergavenny and Hereford Railway from Pontllanfraith to Hengoed
Monmouthshire Clydach Tunnels Railway 250 270 yd Between Nantyglo and Govilon. Closed 1958 1862, doubled 1877
Monmouthshire Gelli-felen Tunnels Railway 230 352 yd Co-located with Clydach. On a continuous curve of approximately 120 degrees 1862
Monmouthshire Monmouth Troy Railway 130 140 yd Disused and blocked
Monmouthshire Usk Railway 234 256 yd Disused but walkable 1857
Neath Port Talbot Cymmer, Afan Valley Railway 1,455 1591 yd Built by the Great Western Railway. Single track. Straight. North end relandscaped
Neath Port Talbot Gelli, Afan Valley Railway 153 167 yd Rhondda and Swansea Bay Railway. Single track. Stone and brick. Closed 1964. 1882
Neath Port Talbot Gyfylchi Tunnel, Tonmawr Afan Valley Railway (disused) 932 1019 yd Single track. North end collapsed 1947. South Wales Mineral Railway. 1863
Neath Port Talbot Cwmcerwyn, Maesteg Railway 925 1012 yd Built by the Port Talbot Railway and Docks Company. Single track, curved. 1964
Newport Hillfield Tunnels, Newport Railway 700 770 yd Mainline tunnel west of Newport railway station.
Newport Gaer Tunnel, Newport Railway 369 403 yd Line to Bassaleg west of Hillfield Tunnels.
Newport Brynglas Tunnels Road 370 400 yd Twin-bore, two-lane tunnels on M4. 1967
Pembrokeshire Castle Tunnel, Maenclochog Railway 91 99 yd Used for target practice in WWII. Closed 1949. 1867
Pembrokeshire Saundersfoot Railway Railway 450 490 yd 3 short Coppet Hall Tunnels on the shoreline plus the longer Hill Tunnel inland
Powys Torpantau Tunnel Railway 610 667 yd Brecon and Merthyr Railway. Also called Summit or Beacons Tunnel. Highest rail tunnel in UK. 1863
Powys Tal-y-llyn Tunnel Railway 616 674 yd Brecon and Merthyr Railway 1864
Powys Ashford Tunnel Canal 343 375 yd Monmouthshire and Brecon Canal 1800
Powys Rhayader Tunnel Railway 270 290 yd Mid Wales Railway. Closed 1963. Now a nature reserve 1864
Merthyr Tydfil CBC Abernant / Merthyr Railway 2,283 2497 yd Mainly single track, curved at ends. 1853
Rhondda Cynon Taf Garth or Walnut Tree Tunnel Railway 410 450 yd Barry Railway Company branch to Llanbradach. Double track. Closed 1963. Partly breached by Garth Quarry. 1905
Merthyr Tydfil CBC Morlais, Merthyr Tydfil Railway 950 1040 yd Double track, curved at west end. 3 airshafts. Closed 1964. Linked LNWR with BMR. 1874
Merthyr Tydfil CBC Quaker's Yard Tunnel, Cefn-Glas Tunnel, Abercynon Railway 643 703 yd Vale of Neath / West Midland Railway GWR. Closed to traffic in 1964. 1851
Rhondda Cynon Taf Rhondda, Treherbert Railway 3,148 3443 yd Single track. Longest tunnel in Wales 1890
Rhondda Cynon Taf Tinworks, Treforest Water 140 150 yd Mill race "feeder" for Crawshays Tinworks. Tunnel made when embankment was constructed 1907
Rhondda Cynon Taf Treforest Railway 1,255 1373 yd Barry Railway Company 1889
Rhondda Cynon Taf Tongwynlais Railway 160 180 yd Cardiff Railway through the Taff's Well gap. Closed 1938. Removed in building A470 road. 1907
Swansea Llangyfelfach Tunnel Railway 1,785 1952 yd Active freight-only line on Swansea District Line 1912
Swansea Peniel Green Tunnel (Lonlas) Railway 845 924 yd Active freight-only line on Swansea District Line 1912
Vale of Glamorgan Wenvoe Tunnel Railway 1,707 1867 yd Barry Railway. Closed 1964 1898
Wrexham Chirk Tunnel Canal 420 459 yd First in UK to have a towpath 1902

Read more about this topic:  List Of Tunnels In The United Kingdom

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