The departure times of some trains from Mallow, Charleville and Limerick junction will be advanced by up to three minutes from this Sunday.
This is due to the addition of a new platform at Limerick junction, which will make operations more efficient, Irish Rail said.
Departure times from Cork and Limerick will remain the same.
The new platform will be accessed by lifts and a footbridge at Limerick Junction, which is clearly signposted. Staff at Limerick Junction will also be assisting customers as they get familiar with the layout.
For details of all travel times, please check http://www.irishrail.ie for details.