All train services have been suspended between Dun Laoghaire and Bray.
Irish Rail says the DART is operating from Howth-Malahide to Dun Laoghaire only.
It is due to flooding on the line at Sandycove.
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However Dublin Bus is honouring valid tickets for the duration.
Intercity & Commuter transfers
Rosslare Intercity and Gorey Commuter services will operate with a bus transfer from Bray to the City Centre in both directions.
Irish Rail says all other routes are operating as normal and that staff are on site monitoring water levels at Sandycove.
It is directing customers to its website for the latest updates.
Iarnród Éireann has also apologised for any inconvenience caused.
