This would be amazing.
Dublin could have a new six line Metro system in place by 2025.
CEO of Metro Dublin John van der Poll thinks the capital could bring in the system relatively cheap and save Dubliners massively in travel time.
The lines would run from Ashbourne, Swords, Donaghmede, Rathfarnham, Blanchardstown and Adamstown.
They would link up in a central loop running under the city.
The Metro Dublin plan would cost €9bn, which he says is a third of what would normally be considered for a project of this size.
Speaking on Newstalk Breakfast, Mr van der Poll said: "It's going to cost €9bn and its going to be paid by private financing.