Train services on the Dublin to Belfast route have been suspended following a death on the line at Skerries.
No trains are operating between Malahide and Drogheda, and disruptions are expected to continue until around noon.
Users of the Northern Commuter service have been advised to make alternative travel arrangements, and Dublin Bus are accepting valid rail tickets.
Update: Northern line remains closed between Drogheda-Malahide due to tragic incident on line. Dublin bus accepting rail tickets.
— Iarnród Éireann (@IrishRail) October 2, 2017
Emergency services are currently at the scene, and the death is being treated as a personal tragedy.