There are four suburban rail lines that ply Dublin and its suburbs. They mostly run through Dublin's suburbs and are used by commuters. More relevant is the DART (Dublin Area Rapid Transit) line, which runs along the coast. Tickets can be purchased at ticket booths or machines at each station. Prices range from about €2.00 to €5.00, depending on your destination.
The Luas, on the other hand, is an excellent option for tourists. Dublin's tram covers many of Dublin's most important attractions. There are two unconnected lines with a combined 49 stations. The Green Line runs from St. Stephen's Green to Sandyford in the south. The Red Line runs from Connolly Station to Tallaght. The tram runs from 05:30-01:30 daily and tickets can be bought from vending machines at each platform.
Dublin's mass transit system is in the midst of an expansion. Another Luas line is under construction, and several more are in the planning stages. There's also another DART line being built on Dublin's west side. The Dublin Metro is in the advanced planning stages, and the first line could be completed within the next few years.
Rechargeable, prepaid tickets are available which are good on all the city's buses and trains, plus a number of other transit services. It's definitely a worthwhile investment for tourists. The rest of Ireland's rail network covers the entire country and all major cities. It's the best and most convenient option for intercity travel.
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