Luas (Irish pronunciation: [ˈl̪ˠuəsˠ]; Irish for "speed") is a tram/light rail system in Dublin, Ireland, which in 2014 carried 32.4 million passengers.There are two main lines: the Green Line, which began operating on 30 June 2004, and the Red Line which opened on 26 September 2004. Since then, both lines have been extended and split into different branches.