Irish Rail says a diesel train was needed to help the operation yesterday
30 passengers had to be rescued from a DART that became stranded last night in Co Wicklow.
Irish Rail says the train got stuck after damage was caused to overhead wires between Bray and Greystones.
Customers were stuck in carriages for three hours.
Irish Rail spokesperson Barry Kenny says the lengthy operation was a result of the challenging terrain.
He explained: "In an exposed area like that - on an uneven surface, in the dark, on Bray Head - is not somewhere that we could safely walk 30 customers on board back from.
"That's why we had to get an assisting diesel train to the site."
Services between Bray and Greystones remained suspended for a period this morning, but they have since resumed.
Line now reopening between Greystones and Bray. 05.35 Rosslare to Dublin/Dundalk departing Greystones now, followed by additional 08.10 from Greystones (limited stop service, see next tweet) and 08.30 Greystones to Howth DART. Full service thereafter— Iarnród Éireann (@IrishRail) April 6, 2018