Rail WI - Dublin analogue of Picc-Vic Tunnel or Crossrail Glasgow

Indeed.

Curious to know what a link between Sligo and Derry would have worked given what once existed in OTL?

One issue with any major capital spend around Derry is the traditional underfunding it's got due to the sectarian divide (hence why the road network is still waiting for it's upgrade for decades), but again if such links had existed it could have had an impact on development in the Northwest.
 
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