Córas Iompair Éireann (Irish Transport System) operates public transport in Ireland. It operates most if not all main forms of public transport in Ireland.
Buses in Ireland can be divided into 2 categories: Dublin services and non-Dublin services. Dublin buses are operated by…well…Dublin Bus (or Bus Átha Cliath in Irish), whereas Bus Éireann operates all intercity bus services as well as Cross-Border services to Belfast.
Given that Dublin is extremely walkable, chances are, like me you won’t use Dublin Bus at all. As such I can’t provide much information on them, beyond the fact that they apparently do not publish route maps at all.
Bus Éireann services are reliable, and do follow the scheduled timetable. Longer distance services are operated under the Expressway branding, and feature comfortable seats that beat Translink Goldline’s by a long shot. Unlike Goldline, all intercity Bus Éireann tickets can be purchased online, whereas local services have to be purchased on the bus or at the counter/ticketing machine in the local bus centre.
Railway services are provided by Irish Rail (Iarnród Éireann), and unlike NI the rail service in Ireland is a lot more extensive.
The rail services can be divided into 3 categories: DART, Commuter, and Intercity.
DART stands for “Dublin Area Rapid Transit”, and is essentially Dublin’s rapid transit system, running on the only electrified section in all of Ireland. Trains are frequent, and runs along the eastern side of Dublin. A major stop for the DART is Dublin Connolly station, which hosts Commuter Services, some Intercity services as well as the Cross-Border Enterprise service.
Commuter services operate around the Dublin, Cork, Limerick, and Galway areas, though Dublin features more services than the other 3 areas. Trains are diesel multiple units (DMU) as they run along un-electrified sectors as well.
Intercity services form the backbone of Ireland’s rail transport network. The terminal station for most intercity services is Dublin Heuston, located on the west side of the city. It serves intercity trains coming from the Western part of Ireland; On the other hand Dublin Connolly serves Northern and Southern Intercity services. All trains are DMUs, with the exception of the service to Cork, which utilise sleek locomotive drawn carriages. Intercity services are reliable and heavily used by locals, and the trains are pleasant enough to ride in, though the legroom can be a bit tight somewhat.