A rock fall close to the entrance of a tunnel at Bray Head has resulted in the closure of the rail line between Bray and Greystones, with Iarnród Éireann warning the disruption to services could last for several days.
Iarnród Éireann said the rock fall has the potential to collapse onto the rail line.
Dart services between Bray and Greystones were cancelled today.
Bus transfers are operating between Bray and Greystones for all Dart services until further notice. All other Dart services north of Bray are operating as usual.
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The Gorey commuter and Rosslare Intercity services have also been disrupted and are being part substituted by bus until further notice.