Wifi should work on all ICR/22k trains nationwide, assuming all are actually fitted as Irish Rail claim. I have a confirmed report of working wifi on a Rosslare Dublin service.
The Blackrock to Killiney section plus Bray Greystones will never have good coverage due geography and even use of satellite would not solve this.
The coverage around Rathdrum is surprisingly good, but Arklow Gorey is poor
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