Irish Rail is currently working to fix the issue.
There are delays of up to 45 minutes for trains heading in and out of Heuston Station after equipment was vandalised overnight.
Irish Rail says a cable was stolen from its signalling system between Newbridge and Kildare.
Services through the Phoenix Park tunnel are also affected, and services from Heuston to Portlaoise will terminate at Newbridge.
Irish Rail spokesperson Jane Cregan says they're working to fix the issue:
Calls Grow For 24 Hour Garda Station In Edenderry After Arson Attack
An online petition has been set up.
Appeal Date Set For Jozef Puska Over Murder Of Ashling Murphy
His appeal is scheduled to begin on 23rd April.
Offaly Town Demands Meeting With Garda Commissioner And Justice Minister
A petition to make Edenderry Garda Station open 24 hours a day is nearing its goal.
Ireland’s First Kidney Pancreas Transplant Recipient Dies Aged 68
Westmeath's Mairead Ward received the procedure in 1991.
Quality Of Life To Drive Offaly’s Appeal For Foreign Investment - Anna Marie Delaney
IDA Ireland plans to develop a new business park in Tullamore.
Hundreds Of Mourners Gather For Tadgh Farrell's Funeral
The funeral was held in St Mary's Church this afternoon.
Dancing With The Stars ‘A Once In A Lifetime Opportunity’ - Rose Of Tralee
The hit series makes its comeback on our screens in January.
Uisce Éireann To Submit €6b Water Project Plan
The project is designed to safeguard the drinking water supply for nearly half of Ireland’s population.
Pedestrian Killed In Midlands Crash
Gardaí and emergency services are currently at the scene of the incident.
Gardai Arrest Four Men Over Laois Prison Assault
It's alleged to have taken place in Midlands Prison last Saturday.
Maura Higgins Set For Traitors US
The Midlands celeb wants to be a traitor.
Man Taken To Hospital Following Alleged Westmeath Assault
The incident occurred in Kinnegad.
Osteoarthritis Programme Launched At Midlands Hospital
It was developed in Denmark and is now implemented in over 10 countries.
Laois County Fire And Rescue Service Welcomes Two New Fire Appliances
The two appliances will soon be operational in Portlaoise and Mountmellick.
Offaly TD Welcomes New IDA Ireland Investment
Fianna Fail's Tony McCormack says it's needed to keep commuters closer to home.
Gardaí At Midlands Collision Involving Pedestrian
The incident occured outside Edenderry.
Gardai Conduct House Searches In Connection With Offaly Arson Attack
Three premises are being investigated across Offaly and Kildare this morning.
Funeral For Offaly Arson Attack Victim To Be Held Today
His father, has been denied compassionate bail to attend his funeral.
Emergency Services At Scene Of Offaly Crash
The incident took place on JKL street.
Tadgh Farrell’s Father Denied Compassionate Bail To Attend Son’s Funeral
Aaron Holt has a significant history of committing crimes while on bail.
