The Department of Transport has ordered 100 energy-efficient DART carriages to replace the original fleet in service since the DART opened in 1984.
It follows two previous orders in recent years for new DART trains, and brings the total Government investment in new electric-powered DART trains to around €670m.
The first order was for 95 carriages, which will enter service mainly on the line from Dublin to Drogheda from the first half of 2027. The second order of 90 DART carriages will enter service from 2028.
The latest order for 100 carriages is an investment of €173.9m, to replace the original DART carriages used on the coastal line from Greystones to Malahide/Howth.
It will bring the number of DART carriages ordered to 285, made up of 57 five-carriage trains.
The order has been placed with global manufacturer Alstom by Iarnród Éireann, through the National Transport Authority (NTA).
Anne Shaw, Chief Executive of the NTA, said: "These new trains will ensure DART continues to deliver sustainable transport along the corridor, improving the efficiency of the service and improving the reliability, accessibility and comfort of DART users."
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Minister for Transport Darragh O'Brien said: "The rollout of these carriages will help ensure that we continue to provide a sustainable and reliable DART service in the years ahead, as we work to expand the DART network under the DART+ Programme."
At least 23 million passenger journeys will have been made on existing DART services from Greystones to Malahide/Howth in 2025, the highest number ever seen.
All of the carriages will provide additional capacity for the Greater Dublin Area rail network as part of the DART+ Programme, in response to record passenger demand.
The full DART+ Programme, encompassing new fleet and infrastructure works under DART+ West, South West, Coastal North and Coastal South, will double the capacity of rail services in the greater Dublin area, according to the Department of Transport.
