Delays for rail commuters after major signalling fault

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Iarnród Éireann passengers have been warned to expect delays of up to 60 minutes on train and DART services after a "major signalling issue" in Dublin.

The signalling power supply fault affecting all services between Landsowne and Donabate has since been resolved and trains have resumed.

Affected services include: DART, Belfast, Northern Commuter, Sligo, Rosslare Maynooth and M3 Parkway/Hazelhatch.

Barry Kenny, Head of Corporate Communications at Iarnród Éireann, confirmed the fault has since been resolved by Iarnród Éireann's technical team.

He said all services resumed just before 1.10pm and that delays will ease through the early afternoon.

"We apologise to customers affected," said Mr Kenny.

Iarnród Éireann said alterations wiill be made to help service recovery, while knock-on delays can be expected due to severe congestion.

Update: Delays are beginning to ease as we regulate services back to schedule. -AD

Alterations can be expected. Delays of up to +60mins will continue to ease for the following services:

DART

Belfast

Northern Commuter

Sligo

Rosslare

Maynooth

M3 Parkway/Hazelhatch https://t.co/S3ST9rKlfL

— Iarnród Éireann (@IrishRail) August 20, 2026