It has emerged that problems with the LUAS tracks are more significant than previously disclosed.
A series of reports commissioned by the Railway Procurement Agency warns problems with tracks on LUAS could cause excessive widening between rails.
The RPA says the issue is being monitored every week and that the network remains totally safe.
The Railway Procurement Agency says about 5% of Luas track will require remediation to eliminate the risk of any significant long-term deterioration.
Work on addressing the problems, which could cost up to €10m, will commence in the coming months.
