We demand our rail line to Navan - FF gombeen booted out by the people of Meath

[Roll_On]

DARTu is not designed for diesel trains because the required ventilation would add significantly to the cost and disruption and it is already possible to move trains between the Belfast and South Western lines. I would suggest that trains coming from Belfast Divert onto new tracks south of Drogheda continue southwards to Dublin airport then in tunnel under Finglas to Liffey Junction and then through the Pheonix Park Tunnel to Heuston and on to Cork, creating a Belfast-Dublin Airport-Dublin Heuston_Limerick Junction-Cork Kent service.

This corridor is where to look when considering future investment in high speed.

[MarkD]

By the time DART Underground is built the Enterprise equipment will be 25 years old or more (15 now). Dual mode multiple units which can handle diesel, 1.5kV DC and 25kV AC already exist in service with SNCF.
Transportation > Products Services > Rail Vehicles > Commuter and Regional Trains > Hybrid Multiple Units > AGC

Such a train could, for example, start from Cork, run at 25kV AC to Kildare, switch to 1.5kV DC through the city via DARTu to Drogheda and switch to diesel from there to Belfast.

In fact, the 1.5kV/diesel version (B 81500 class) is what should have been bought for Connolly suburban service, not more 22000 class vehicles which have been sitting in Heuston for an alarmingly long time.