It's because of a signalling fault.
Services between Maynooth and Louisa Bridge are suspended.
Irish Rail says it is because of a signalling fault.
Services are operating from Clonsilla to Connolly station.
Dublin Bus is honouring valid rail tickets between Maynooth/Leixlip and City centre
Due to the signalling fault between Maynooth and Leixlip Louisa bridge. Services are currently operating from Clonsilla to Connolly station. Dublin bus is honouring valid rail tickets between Maynooth/Leixlip and City centre - MH https://t.co/o0n51TZLLy
— Iarnród Éireann (@IrishRail) May 28, 2021

Friday's Kfm Obituary Announcements
New Cultural Programme Set For Castletown House
Celbridge Woman Who Lost Sister To CF Calls For People To Support Today's Fundraiser
Protestors, Including Kildare's John Dallon, Refused Entry From Government And Agriculture Bodies Meeting
Defence Forces Travelling To The Curragh Today For Training
Newbridge Silverware’s Silver-plated Cutlery Factory Officially Closes
Martin Heydon Will Meet Farming And Haulier Groups This Morning Amid Fuel Protests
Missing 17-Year-Old Joshua Treacy From Maynooth Has Been Located