Iarnród Éireann has warned commuters to book their tickets for the Bank Holiday weekend early as revised timetables, and major works cause significant disruption to travel plans.
Customers should check times before travelling for alterations at www.irishrail.ie or the Iarnród Éireann app and book Intercity travel in advance.
Major works are also taking place, resulting in two significant line closures and alternative arrangements during the weekend.
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Due to track and overhead line works in Malahide, signalling works between Howth and Howth Junction, and culvert replacement between Drogheda and Dundalk, the following service alterations are in place from Saturday, October 29 to Monday, October 31 inclusive:
There will be no DART services between Howth Junction and Howth/Malahide, but Dublin Bus and GoAhead will accept rail tickets to and from affected areas.
DART services will operate between Howth Junction and Greystones.
There will be no commuter rail services between Dublin and Drogheda/Dundalk.
A limited bus replacement service will operate between Dublin Connolly and Drogheda, serving Donabate and Balbriggan only.
Due to the works detailed above, and works by Translink in Northern Ireland, Dublin to Belfast Enterprise rail services will not operate. However, again bus replacement services will be operating.
Due to a series of track and signalling works taking place, the line between Portarlington and Thurles is closed from 2.30pm on Saturday, ensuring that full services will operate at the busiest times of the weekend.
All services between Dublin and Cork, Kerry and Limerick, will be part-replaced by bus transfers, and to a revised schedule, with other services also affected:
Services between Cork and Dublin Heuston will operate to a revised schedule, with bus transfers between Thurles and Kildare in both directions. Please check the times before travel.
Direct services between Limerick and Dublin Heuston are cancelled.
Journeys between Limerick and Dublin Heuston, involving a change at Limerick Junction, will have bus transfers between Thurles and Kildare in both directions.
Direct services between Tralee and Dublin Heuston will operate as follows:
Saturday: 5.05pm Heuston to Tralee will operate between Mallow and Tralee only - passengers are asked to use Heuston to Cork service to connect at Mallow.
Sunday: 8.30am Heuston to Tralee will operate with bus transfers between Thurles and Kildare.
Commuter services between Portlaoise and Dublin Heuston will involve bus transfers between Portlaoise and Portarlington in both directions.
Customers are advised to check times before travel, with full details at www.irishrail.ie and at the Iarnród Éireann app.
A spokesperson said: "We apologise to customers for any inconvenience from these essential works."
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