There are also delays to Luas services in the city centre.
Iarnród Eireann has warned passengers to expect “significant delays” on Wednesday morning (9 October) on services into and out of Heuston Station in Dublin.
The delays are a result of what Irish Rail has referred to as “overnight vandalism” of the signalling system.
“Our App and realtime departures on the website takes its information from the signalling system,” noted a statement issued on Wednesday morning via Twitter.
“As a result of this, information for services into and out of Heuston and Phoenix Park tunnel services is not accurate this morning.”
Commuters are advised to expect delays in the region of 45 minutes as the problem is worked on.
“Delays are not as severe to Newbridge/Hazelhatch and Grand Canal Dock services,” Irish Rail said in an updated statement, with initial delays of up to 60 minutes reported concerning those specific stations.
In Dublin city centre, Luas Red Line services are operating with delays of up to 30 minutes as of Wednesday morning due to a failed tram.
Tickets are valid on Dublin Bus as service returns to normal, notes a Luas statement.
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