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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