Iarnród Éireann has warned people of disruptions to its rail services over the busy Easter Bank Holiday weekend, with several trains fully suspended.
Major works from tomorrow to Monday will affect Connolly to Howth, Drogheda and Belfast services, it said in a statement.
"A series of works including track renewal, overhead line renewal, and signalling commissioning works will take place between Connolly and Dundalk, as well as separate track works by Translink in Northern Ireland," said Iarnród Éireann.
DART services between Connolly and Howth/Malahide will be suspended with Dublin Bus and Go Ahead accepting train tickets on its buses.
Dublin Connolly to Belfast Grand Central trains will also be fully replaced by buses to a revised schedule.
Northern commuter services will also be suspended with a limited bus transfer service from Drogheda, Balbriggan and Donabate stations to and from Connolly station.
There will also be replacement buses running between Skerries, Rush and Lusk to Connolly.
Iarnród Éireann added that booking a seat on intercity services in advance is "strongly advised, particularly at busiest times and during the times of major works".
It apologised to customers for the inconvenience caused by these "essential works".
Speaking on RTÉ's News at One, Barry Kenny of Iarnród Éireann said that the works will not be as disruptive to passengers as feared.
"For Easter in particular, Thursday and Friday are the busiest days, and we don’t have works today, or yesterday. Through an Easter weekend, when you do have disruptive works, you can get a lot more done," he said.
"It means that the overall disruption is lesser, and that we don’t have to go back on multiple shorter weekends to do works. Most of what we do takes place overnight, but when you’re replacing track, replacing overhead lines and commissioning new signalling systems, all of which we are doing this weekend, they are longer scale works.
"There’s never a perfect time to do them, but other modes have capacity this weekend to assist us with customers who are looking to travel," he added.
