The move means commuters taking the train south of Kilcoole will be able to avail of the Leap Card system.
The Dublin City Zone will extend around 23 kilometres from the city, nearly resembling the present 90-minute fare zone.
Enfield, Clane, Prosperous, Newbridge, Kildare, Greystones, and Wicklow will be part of the Dublin Commuter Zone, which extends around 50 kilometres from Dublin's City Centre.
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