The Government is due to place an order for new battery-electric train carriages.
90 new carriages will be used to expand the DART system into the greater Dublin area and eastern region.
The new trains could also be used for a future rapid transit system in Cork.
It's estimated the expansion could see 600,000 people have access to rapid transit by 2026 when they're delivered.
The new carriages will also be part of the roll-out of DART+ to Drogheda, Maynooth and Celbridge/Hazelhatch.
