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).
Cork Electric Tramways and Lighting Company; opened 1898, closed 1931
Dublin and Lucan Electric Railway; opened 1900, closed 1925
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
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; opened 1888, closed 1924; partially preserved