DART services are now back to normal following serious disruption early this morning.
Commuters experienced delays of up to half an hour on northbound and southbound services between 7.30 a.m. and 9.30 a.m.
An Iarnród Éireann spokesman said the delays were caused by problems with an overhead line at Connolly Station. Only one of three Connolly Station platforms that are used by the DART were operational.
Last week an electrical fault caused delays on DART services for 40,000 commuters.