Plans for the proposed Dublin Metro called for St Stephen's Green to be used as the southern terminus of a line to Belinstown, with a tunnel at the north-western corner of the park.
While originally targeted for 2013, these plans were subsequently indefinitely deferred.
Similar plans for a DART network extension proposed an underground station at St Stephen's Green.
Though targeted to start in 2015, these works were also indefinitely deferred.

In March 2018, the Dublin Metro was rebranded under the name "Metrolink", and proposed to run from Swords in the north, passing through Dublin Airport and the city centre to points in the south.
A version of this Metrolink plan proposes that an underground station be built on the Eastern side of St Stephen's Green - potentially allowing passengers to cut through the park to connect with the Luas stop.
Plans for the proposed Dublin Metro called for St Stephen's Green to be used as the southern terminus of a line to Belinstown, with a tunnel at the north-western corner of the park. While originally targeted for 2013, these plans were subsequently indefinitely deferred. Similar plans for a DART network extension proposed an underground station at St Stephen's Green. Though targeted to start in 2015, these works were also indefinitely deferred.
In March 2018, the Dublin Metro was rebranded under the name "Metrolink", and proposed to run from Swords in the north, passing through Dublin Airport and the city centre to points in the south. A version of this Metrolink plan proposes that an underground station be built on the Eastern side of St Stephen's Green - potentially allowing passengers to cut through the park to connect with the Luas stop.
St Stephen's Green station