Irish Rail says a DART extension that was granted planning permission today will "transform" communities.
Dart+ South West adds an electrified track through Park West, Cherry Orchard, Clondalkin, Lucan and Celbridge.
The project includes adding track and re-signalling the line, building a new station at Heuston West and upgrading the Phoenix Park Tunnel.
Irish Rail says the process of finding a construction contractor will follow - it hopes to break ground in 2026.
Teen M9 Fatalities Were Known To Gardai in West Wicklow
Talented Wicklow Pair Shortlisted for National AIB Portrait Prize
Wicklow Rose Ready To Bloom On TV Screens Tonight
'Nothing Is Off The Table' - Wicklow TD Outlines Concerns Over Planned Fuel Excise Increases
Concern Grows For Missing 53-year-old