DART Underground (), previously known as the Interconnector, is a planned railway tunnel in Ireland, projected to run under the city centre of Dublin. The tunnel would allow for the expansion of the electrified DART and the Dublin Suburban Rail network, and connect Heuston Station with Pearse Station. In November 2011 the government announced that the project would be deferred until 2016 at the earliest. A month later a Railway Order permitting the construction of the project was granted in December 2011 by An Bord Pleanala.