Train services are returning to normal after a signalling fault caused disruption this morning.
All DART, northern and Maynooth commuter services as well as Belfast and Sligo services were hit for a time by the disruption.
Iarnród Éireann says there will be knock-on delays on some DART services but that travel times were expected to return to normal this afternoon.
The 11am train from Dublin to Belfast was delayed by 30 minutes before beginning its journey.
