The Phoenix Park rail tunnel in Dublin opened this morning, improving services for rail commuters in Kildare and Dublin.
The tunnel, refurbished with funding from the National Transport Authority, will connect Newbridge and Hazelhatch in Kildare with Dublin Connolly and Grand Canal Dock.
Originally built in 1877, the 700 metre tunnel under the Phoenix Park has rarely been used for passenger services.
There will be seven morning peak trains from Newbridge and Hazelhatch to Grand Canal Dock and eight new evening peak-time services.
Iarnród Éireann plan to expand these services to include off-peak and weekend services.
Minister for Transport Shane Ross, one of the first passengers on the train this morning, said the Phoenix Part tunnel line is "a vital part of our rail infrastructure and I know that it will prove to be of immense benefit to the travelling public".