The Dublin to Sligo main line is a railway route operated by Iarnród Éireann in Ireland. It starts in Dublin Connolly station, terminating at Sligo Mac Diarmada railway station in Sligo. The route is a double-track railway as far as Maynooth, being a single-track railway with passing loops between there and Sligo. Between Dublin and Longford, the route is operated as part of Dublin Suburban Rail, specifically the Western Commuter service. In 2018, 1.4 million passengers were carried on the line.