Publication of a revised route for the Dublin Metrolink has been delayed to allow further time for design of additional underground section and is expected to result in delays to submission of the planning application.
The route for the 26km rail route was expected to be published in November, which had already been delayed from August, but Metrolink has now confirmed a further delay regarding the route.
Metrolink has said that the extension of the underground section at the southern end called for additional design work and the final route will now not be published until February.
It is expected that the tunnel extension will add €100M (£90M) to the over €3bn (£2.7bn) cost of the project.
The additional design work will also have an impact on the planning application, which was expected to be submitted this year, and it is understood that the application will now not be made until 2020. Construction on the route was scheduled to start in 2021 and be completed in 2027 but Metrolink has not commented on how the design and planning delays will impact on this.
A spokesman for the National Transport Authority said there were a “number of very important public concerns and engineering elements contained within a project this scale and complexity” which it was working to resolve.