British Heritage Railways in Wales

• Llangollen Railway Heritage railway 4 ft 8+1⁄2 in (1,435 mm) 16km 1862 1964 1981
• Conwy Valley Railway Museum Museum and miniature railway 7+1⁄4 in (184 mm) 1.6km 1970s Has a 0.8km long 15 in (381 mm) gauge tramway
• Penrhyn Castle Railway Museum Museum N/A 0km 1951
• Bala Lake Railway Heritage railway 1 ft 11+5⁄8 in (600 mm) 7.2km 1861 1965 1972 Originally standard gauge line
• Ffestiniog Railway Heritage railway 1 ft 11+1⁄2 in (597 mm) 21.7km 1836 1946 1954 Also owns and operates the Welsh Highland Railway
• Llanberis Lake Railway Heritage railway 1 ft 11+1⁄2 in (597 mm) 4km 1971
• Snowdon Mountain Railway Tourist railway 2 ft 7+1⁄2 in (800 mm) 7.5km 1896
• Welsh Highland Heritage Railway Heritage railway 1 ft 11+1⁄2 in (597 mm) 1.6km 1980
• Welsh Highland Railway Heritage railway 1 ft 11+1⁄2 in (597 mm) 40.2km 1922 1937 1997 Owned and operated by the Ffestiniog Railway
• Fairbourne Railway Miniature railway 12+1⁄4 in (311 mm) 3.2km 1895 1940 1947 Previously 2 ft (610 mm) and 15 in (381 mm)
• Rhyl Miniature Railway Miniature railway 15 in (381 mm) 1.6km 1911
• West Shore Miniature Railway Miniature railway 2018
• Great Orme Tramway Tramway 3 ft 6 in (1,067 mm) 1902
• Glyn Valley Tramway Tramway 2 ft 4+1⁄2 in (724 mm) 0km 1873 1935 c. 2022

• Corris Railway Heritage railway 2 ft 3 in (686 mm) 1.17km 1859 1948 1971
• Talyllyn Railway Heritage railway 2 ft 3 in (686 mm) 11.67km 1865 Includes Narrow Gauge Railway Museum
• Welshpool and Llanfair Light Railway Heritage railway 2 ft 6 in (762 mm) 13.7km 1903 1956 1963
• Vale of Rheidol Railway Heritage railway 1 ft 11+3⁄4 in (603 mm) 18.91km 1902
• Rhiw Valley Light Railway Miniature railway 15 in (381 mm) 1.265km 1970

• Barry Tourist Railway Tourist Railway 4 ft 8+1⁄2 in (1,435 mm) 2.4km 1885 1976 1994
• Gwili Railway Heritage railway 4 ft 8+1⁄2 in (1,435 mm) 7.24km 1860 1973 1978
• Llanelli and Mynydd Mawr Railway Heritage railway 4 ft 8+1⁄2 in (1,435 mm) 0.4km 1801 1989 2017
• Pontypool and Blaenavon Railway Heritage railway 4 ft 8+1⁄2 in (1,435 mm) 5.6km 1866 1941 1983
• Brecon Mountain Railway Tourist Railway 1 ft 11+3⁄4 in (603 mm) 8km 1980
• Margam Park Railway 1 ft 11+3⁄4 in (603 mm) c. 2011
• Teifi Valley Railway 2 ft (610 mm) 1km 1986 Closed 2014 and much of the track lifted. Reopened 2016
• Cefn Mably Farm Park Railway Attraction Miniature railway 12+1⁄4 in (311 mm) c. 2020
• Heath Park Electric Tramway 18 in (457 mm) 0.2km
• Garw Valley Railway Heritage railway 4 ft 8+1⁄2 in (1,435 mm) 8km 1876 1997 c. 2001