Intending train passengers are facing disruption over the Easter bank holiday weekend as Iarnród Éireann carries out works at several locations.
Iarnród Éireann and other transport companies are preparing for the extra demand on services over the coming days.
Lines affected include Heuston to Kildare, Heuston to Waterford and Connolly to Skerries. Bus services will operate between the affected areas.
Spokesman Barry Kenny told RTÉ’s Morning Ireland that Easter is one of the few times that allows the opportunity to carry out such works without affecting the busiest commuter travel days.
DART services will not operate between Howth/Malahide and Dublin Connolly tomorrow or Sunday.
Dublin Bus will accept rail tickets and services between Connolly and Bray/Greystones will operate.
Almost 368,000 passengers are expected to travel through Dublin Airport between now and Monday, representing a 10% increase compared to last Easter.
More than a half a million passengers are expected to travel with Bus Éireann on its 240 routes in the coming days.
Gardaí and the Road Safety Association have appealed to motorists to drive carefully.
They say that 59 people have been killed or seriously injured in Easter bank holiday crashes since 2012.
For the first time since 1927, pubs are being allowed to open on Good Friday.
Minister for Transport Shane Ross has urged people who have a drink in the pub to leave their car at home.
Meanwhile, Met Éireann is forecasting frosty and showery weather this weekend with temperatures due to fall to -3C in some areas tomorrow night.