Thousands of Luas commuters faced disruption this morning due to a power failure on the Green Line.
Full service has now been restored between St Stephen's Green and Brides Glen.
Service was also interrupted last night due to a lightning strike.
Dervla Brophy - a spokeswoman for Veolia Transdev, the company which run the Luas - said there was a "probability" the power failure today was linked to the lightning strike.
Luas Red Line services are operating as normal.
#Luas Greenline has been restored, please see http://t.co/T2YprEVvMj
— Luas (@Luas) May 20, 2015