Iarnród Éireann has made contingency plans for next week's services on the Dublin-Belfast rail line following the collapse of part of the line.
For full details of the services click here
The Dublin to Belfast Enterprise route will be serviced by a bus between Drogheda and Dublin and the journey is expected to take an extra 30 minutes.
The Northern Commuter service will run between Drogheda and Skerries but there will not be a connecting bus.
A special bus will run between Drogheda and Connolly Station in Dublin and rail tickets can be used.
Dublin Bus will provide extra buses on the number 33 and 33B routes, which will service Balbriggan, Skerries, Rush & Lusk and Donabate.
DART services between Malahide and Howth Junction are operating normally.
The service will be disrupted for at least three months after a 20-metre section of the viaduct gave way at the Broadmeadow Estuary in Co Dublin on Friday evening.
Part of the line has been closed since the incident happened on Friday, but the full impact on commuters will be felt tomorrow morning.
The line is one of the busiest in the country and up to 10,000 passengers are facing disruption.
The collapse is the second such incident in past six years.
A railway bridge gave way at Cahir in Co Tipperary in October 2003 leading to the derailment of a freight train.
Conor Faughnan of AA Roadwatch has said it is absolutely crucial that the service is up and running as soon as possible.
Mr Faughnan said the Dublin-Belfast line is the most important rail line in the country.
He added that the disruption to rail services will inevitably cause traffic disruption on the roads as more people take their cars to work.
Meanwhile, the Construction Industry Federation has called for an immediate assessment of all bridges used by Irish Rail.
Don O'Sullivan of the CIF said the cost of repair could range from €1 million to €25 million depending on the outcome of the investigation into the incident.
