The first longer Luas tram is running along the Green Line.
The 55 metre-long carriage is the first of six due to be delivered over the next few months.
It's hoped the extra capacity will help ease severe over-crowding at peak times.
The first left Bride's Glen shortly after 8 o'clock this morning. Are you on it? Tell us what it's like!
Seven are to be deployed between now and June and it's hoped they'll ease crowding during the busy rush hour commute.
