The operator hasn't clarified what the incident was.
A number of train services will be delayed this evening due to what Irish Rail is calling a "vandalism" incident.
Services between Maynooth and Bray are affected all day but the operator hasn't clarified what the incident was.
Passengers are advised to check Irish Rail's social media accounts for further updates.

Water Outage In Place For Maynooth And Straffan Tomorrow
Kfm Obituary Notices
Nationwide Fuel Protest Continues Into Third Day
"I Don't Think Anybody Is Going To Really Listen To Us Until Somebody Dies On That Road": Criticism Of Moone-Timolin Cycleway Continues
International Wholesale Prices Are "Not Price Gouging", Says CCPC
Costs Of Home Heating Oil Up By 67.5 Per Cent Between February and March
91-Year-Old Lelia Doolan To Arrive In Monasterevin Today As Part Of Her Walk For Peace
Over €400,000 Awarded To Repair And Protect Three Kildare Heritage Structures