The Phoenix Park tunnel in Dublin will open to rail traffic full time from next Monday.
It connects the Newbridge line to Connolly station and Grand Canal Dock.
Irish Rail has announced a number of new commuter services to co-incide with the route’s opening.
Barry Kenny is the company’s spokesperson: “From Monday next following a €13.7m investment in Phoenix Park tunnel we’ll be starting new services connecting the Newbridge and Hazelhatch line through to the stations in Connolly and Grand Canal Dock via the tunnel.
“That’s the first time the tunnel will be used for regular and daily commuter services.”
Seven new morning peak trains to Grand Canal Dock, and eight new evening peak trains from Grand Canal Dock begin on Monday 21st November, with limited stop services in the opposite direction.