A group of residents from Ranelagh in Dublin have begun a legal challenge against the planned MetroLink rail line for the capital.
The residents have applied to take a judicial review of the decision to give the green light to the MetroLink project.
The project would see the construction of a 18.8km railway line, most of which will be underground, from Charlemont near Dublin city centre to Swords Estuary in the north of the county.
Twenty people are named in the application from the judicial review, many of them residents of Dartmouth Square off Leeson Street, which is located close to the planned final stop for MetroLink.
A number of the named parties had previously submitted objections to An Coimisiún Pleanála, opposing the decision to locate a major interchange of the metro project at the Charlemont stop.
The application for a judicial review is due to be heard on Monday.
Last month, An Coimisiún Pleanála granted the Railway Order to allow construction of the project to get under way.
Transport Infrastructure Ireland recently announced the project had gone to tender after it held a number of events to try and attract bidders for the project, which will be the largest infrastructure project in the history of the State.
A metro line for Dublin was first mooted in the year 2000, but it was shelved during the financial crisis.
Recent timelines had suggested that if there were no objections, the project could be completed by the mid-2030s.
However, supporters of the project warned that any judicial review could delay that timeline.
