Stopping at intermediate stations on LJn-Waterford should add 2 or 3 minutes per stop (asuming it spends a minute or less actually stopped). No real difference if it's ICRs (as opposed to 2800s). Trains would in many cases have to slow for staff exchange and the low line speed means less time loss.
Also in response to an earlier post, mainline nonstop trains can pass Limerick Junction at 60mph, ususally only 2 or 3 trains on weekdays and maybe more on Sundays.
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