There will be no rail services between Connolly Station and Dun Laoghaire today, to allow for upgrade works on the line.
Commuters travelling between the city and southside stations can use their rail tickets on Dublin Bus.
Note that DART services will operate between Howth/Malahide and Connolly, and between Dun Laoghaire and Bray/Greystones.
Drogheda and Maynooth Commuter services will operate to/from Dublin Connolly Station only.
Normal service will be restored tomorrow, Monday.