See also: Track gauge in Ireland. Ireland formerly had numerous narrow-gauge railways, most of which were built to a gauge of . The last (non-preserved) line to close was the West Clare Railway in 1961 (though it has been partially preserved).
| Railway | Opened | Closed | Length | Notes | |
|---|---|---|---|---|---|
| 1880 | 1950 | 17miles | |||
| 1877 | 1950 | 36miles | Ruling gradient: 1 in 36 | ||
| 1875 | 1940 | 16miles | Highest railway in Ireland at 1045feet | ||
| 1885 | 1948 | 3miles | |||
| 1883 | 1933 | NaNmiles | |||
| 1887 | 1942 | 37miles | |||
| 1883 | 1949 | NaNmiles | Electric | ||
| 1873 | 1884 | 4miles | |||
| 1853 | 1953 | 99miles | Crossed into County Donegal, Ireland | ||
| 1882 | 1926 | 1.85miles | |||
| 1909 | 1960 | 19.25miles | Crossed into County Donegal | ||
| 1877 | 1915 | 3.3miles | Damaged during storm, not restored |
| Railway | Opened | Closed | Length | Notes | |
|---|---|---|---|---|---|
| 1990s | 2008 | tourist attraction | |||
| 1902 | 1932 | 16miles | 1850: | ||
| 1887 | 1934 | 25miles | |||
| 1892 | 1960 | 121miles | 1863: | ||
| 1880 | 1897 | 7miles | |||
| 1879 | 1918 | 2.13miles | |||
| 1886 | 1947 | NaNmiles | |||
| 1891 | 1953 | 32miles | |||
| 1860 | 1892 | 18miles | merged into Donegal Railway Company |
Cork Electric Tramways and Lighting Company
Dublin and Lucan Electric Railway
Steam Train Express (located in the Emerald Park (formerly Tayto Park) theme park); opened 2015 (operating)
The St James's Gate Brewery narrow-gauge tramway, constructed 1873, closed 1975[2]
Bellevue Park Railway (located in Bellevue Park); opened 1933, closed 1950 (defunct - park still operating)
Difflin Lake Railway (located in Oakfield Park); opened 2003 (operating)
Listowel and Ballybunion Railway