Three train carriages were defaced in Athlone last Friday.
Irish Rail say a number of services will operate at reduced capacity this week due to a vandalism issue.
Three train carriages at Athlone station were defaced with graffiti late on Friday night.
The carriages were taken out of service so they could be cleaned and repaired.
A number of services have been impacted as a result and more reduced capacity services will operate tomorrow.
Irish Rail say the majority of these are off peak and they hope to return to full capacity by Friday.
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