Irish Rail is calling for feedback on the DART+ project, which plans to cater to three times as many passengers from Maynooth.
The project - the first part of a wider DART expansion programme - aims to extend the DART to Maynooth from Dublin city centre.
Trains will run on both the Kildare and M3 Parkway lines, while existing infrastructure like Connolly Station and Docklands Station will be upgraded too.
Six level crossings will be closed to accommodate this, while around 40km of track will also be electrified.
A new DART depot facility will also be developed west of Maynooth Station
It's hoped that construction will be completed by 2024, with plans for works to begin in early 2022.
Transport Minister Eamon Ryan said: "DART+ West will have a hugely positive impact, not just at its terminal points in Maynooth and Dunboyne, but in areas like Glasnevin, Broombridge, Pelletstown, Ashtown, Castleknock, Coolmine, Clonsilla, and Leixlip, all of which will now be on an integrated, electrified, fast and reliable, rail network.
"If we are serious about reducing greenhouse gas emissions - and I know I am - this is precisely the kind of project that should be happening."
The public is now being asked to give their feedback on the plans on the Irish Rail website.
The plans are part of a wider DART+ expansion programme, which will also see DART services to Hazelhatch, Celbridge and Drogheda.