The DVTs on the Mark 4 would need TPWS too, in addition to all of the objections listed for Limerick plus clearance trials. Sure, Mark 4s could replace 22s to Cork, but that ignores why they were taken off in the first place: passenger counts which didn't cover the costs of operating a Mark 4 set.
As for the 22s to the north, if they could operate at full speed in the north, get some stretches reclassified to 100mph and were able to handle DART congestion better than loco haul, might not some time savings result which in turn could mitigate the perception of a lower quality cabin? In any case, concerns about 22 cabin would be hard to take from IE considering how often they use 29s on the route,
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