The Christmas services will be available on commuter routes to Maynooth, Kildare and Dundalk
Late night trains are back from tonight.
The extra Christmas services will also be available on commuter routes to Maynooth, Dundalk and Kildare every Thursday, Friday and Saturday.
They'll run each week until the 23rd of December and again on New Year's Eve.
Train passengers are being warned to book their Christmas travel now to avoid disappointment this holiday season.
Extra Intercity and Commuter Belt services will come on stream this Sunday ahead of the busiest festive period expected since before the pandemic.
Under new plans, the 06:15am from Cork to Dublin will become the fastest ever service between the two cities with an estimated travel time of 2 hours and 14 minutes.