The 5.6km line will run north from the existing Green Line terminus at St Stephen's Green, crossing the River Liffey and serving the new Dublin Institute of Technology campus at Grangegorman before terminating at an interchange with Irish Rail's Broombridge station on the Dublin Connolly – Maynooth line. A new depot is also proposed near the station site at Broombridge.

The line will have 13 stations with an end-to-end journey time of 24 minutes, and is expected to boost Luas passenger numbers by around 8 million per year, a 25% increase over current levels.

Despite the economic downturn Luas ridership has remained steady, and the network carried 29 million passengers last year.