Iarnród Éireann are advising customers that a revised timetable will be in place this bank holiday weekend on all routes.
Passengers are being asked to check timetables online and book intercity travel in advance before travelling.
Dart services between Dublin and Howth will be suspended while Dublin Bus and GoAhead will accept rail and train tickets to areas affected from services.
Barry Kenny Communications Manager with Irish Rail says there's major works happening so people need to check times.
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