Entry tags:
our very own Down Street, almost.
Apparently we have a rail tunnel under Phoenix Park. Poking around on Maporama, it appears that a spur breaks off the line into Heuston a few hundred yards before the station proper (i.e. the enclosed section) and disappears on the map when it hits Conyngham Road, and there's another stub line to the northeast of North Road which could well be the other end. I might wander up and have a look at the weekend, see what I can see.