 Prior to July 2004, services were worked by sets of Mark 2D carriages hauled by 071 class locomotives.In April 2008, the signalling on this route was upgraded to the mini-CTC system, controlled from Connolly Station.Apart from the Limerick Junction station area on the Dublin-Cork route, which was itself upgraded to CTC in 2011, it had been the last of the routes radiating from Dublin to use Electric Train Staff (ETS) and semaphore signalling, which was still in place south of Wicklow up until April 2008.