I posted a query on Irish Rail's website and the answer explains what is going on.
"Our projects department discovered a problem with the individual trip
switches on the sockets and they have fitted a trip switch by carriage.
If a passenger plugs in a faulty device it will trip the carriage
instead of just that socket as a safety precaution. The driver can only
reset the system at the end of each journey."
So obviously, the drivers need to be briefed to go through the train and reset the breakers at the end of the journey.
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