Expect delays until the early afternoon.
This is due to an operational issue arising from overnight engineering works between Charleville and Limerick Junction, where one track was closed.
Delays from Cork to Heuston were up to 2 hours and 1 hour from Dublin to Cork.
Disruption is expected to continue until at least 1 o'clock.
Iarnród Éireann apologises to customers for the inconvenience caused and updates are available on their social media .