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

Analysis: Damning Reports Detail Rot, Fire Risks And Rodents At "Temporary" Celbridge Primary School
Kfm Obituary Notices
Major Curragh Community College Project Moves Ahead After Years Of False Starts
Plans For Walking Trail Within Castletown House Lands Under Consideration Subject To Removal Of Laurel
Council Blames Stolen Cars As It Refuses Warning Signs At Crash-Prone Bridge In Celbridge
Naas No-Shows Add To Driving Test Pressure As Kildare Test Queue Hits 1,975
Naas Hospital Promised Just 21 Extra Mental Health Beds At Lakeview Ward - With No Timeline In Sight
R405 Hazelhatch Road To Close Between Loughtown Road And Athgoe Road For Major Pipeline Works