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17 December - The Dublin and Kingstown Railway, the first public railway in Ireland, opens between Westland Row, Dublin, and Kingstown.
The line is also used by rail passengers changing at Dublin Connolly onto the DART to Dún Laoghaire for the Stena Line ferry to Holyhead, or travelling to Dublin Port for the Irish Ferries to Holyhead, and then by train along the North Wales Coast Line to London Euston and other destinations in England and Wales.
Samuel Beckett came from nearby Foxrock and is said to have experienced an artistic epiphany, alluded to in his play Krapp's Last Tape, while sitting on the end of one of Dún Laoghaire's piers.
At first she was used on the Holyhead to Dublin North Wall service, then from 1908 on the Holyhead to Kingstown (later named Dún Laoghaire) service.
Rita and Erskine Childers' daughter, Nessa, entered politics in 2004 when she was elected as a councillor on Dún Laoghaire-Rathdown County Council for the Green Party.
W.T.'s grandson, also called Liam also served as a TD and as Senator and his granddaughter Louise Cosgrave served as a Dún Laoghaire-Rathdown County Councillor from 1999 to 2009.
It is then distributed to customers in Dublin City and in the South Dublin, Dún Laoghaire–Rathdown, Fingal, Kildare and Wicklow County Council areas through a network of service reservoirs and 8,000 km of pipes of which 2,700 km are the responsibility of Dublin City Council.