The Red Line (32 stops) runs from Saggart and Tallaght in the West to Connolly Station and The Point (location and original title for the O2 arena) in the East. Keep an eye on the destination at the front of the tram as some terminate at Heuston Station.
The Green Line (22 stops) is entirely in the Southside and links St Stephen’s Green with Brides Glen.
Of the various fare options, visitors will most likely use Single (€1.60-2.90), Return (€3.10-5.20) or unlimited travel Flexi Tickets (1 day €6.10, 7 days €23). Tickets can be purchased at platform machines or (slightly cheaper) a Luas Ticket Outlet (see www.luas.ie for list). Child prices are significantly cheaper.
There's on-board CCTV and a fine for fare evasion. As most trams have an inspector, it's silly to try and get away with not paying. All stations and trams are equipped to cater for reduced mobility and visually impaired passengers.
Trams run every 9/10mins and 3/6mins at peak times (07:45 - 09:15). During the Christmas and New Year period, and on certain other occasions, special services operate. Check the very informative and easy to use www.luas.ie for updates.