The hearing is expected to last for five weeks
More details about Dublin's long-awaited Metrolink are set to be revealed today.
A five-week oral hearing by An Bord Pleanála is starting this morning - 15 years on since the first one.
It'll involve discussion over how the high-capacity underground railway between Swords, Dublin airport and Charlemont in the south city centre will be built.
TII said the modern and efficient rail link will see trains running every 90 seconds and will be capable of carrying up to 20,000 passengers per hour in each direction and 53 million passengers a year.

€1.2m Approved For Zipline And High Ropes Adventure Centre At Donadea
Christmas Appeal To Adopt Dogs As Euthanasia Figures Rise
Speed Enforcement To Increase In Kildare With 21 New Camera Zones To Be Rolled Out In January
Over 400 Motorists Caught Speeding So Far Today, Including A Driver In Kilcock
Transport Minister In Discussions With Irish Rail About Extending Late-Night Trains Beyond Christmas
Tadhg And Mary Should Be Looking Forward To Christmas, Say Gardai As Fresh Appeal Launched
Bus Shelters Treated As Luxury Rather Than Standard, With 500 Kildare Bus Stops In Need Of Upgrades
Recruitment Announcements Don’t Add Up As Garda Numbers Stagnant In Kildare South, Says Local TD