[2] Named the "Luas Cross City line", this project was announced in 2011 as part of the government's 2012–16 Infrastructure and Capital Investment Plan.

Initial plans for the proposed Dublin Metro called for St Stephen's Green to be used as the southern terminus of a line to Belinstown,[8] with a tunnel at the north-western corner of the park.

[10] Similar plans for a DART network extension proposed an underground station at St Stephen's Green.

[10] In March 2018, the Dublin Metro was rebranded under the name "Metrolink", and proposed to run from Swords in the north, passing through the city centre to points in the south.

A version of this Metrolink plan proposed that an underground station be built on the Eastern side of St Stephen's Green.