Services to Galway and Mayo via Mullingar and Athlone had run through Connolly to Pearse from 1937, but were transferred to Heuston Station in the 1970s. Sunday trains to Cork, Limerick and Waterford during the 1960s operated from Connolly platforms 5, 6 and 7 through the Phoenix Park Tunnel, so as to avoid the cost of opening Heuston for the limited Sunday traffic demand at that time.
