Now in the good old days before Greystones was added to the DART it was fairly normal for trains to operate with the lights switched off on a summers afternoon, that was totally fine but Greystones is no fun without lights
If the lights where off in 2 coaches possibly an electrical fault otherwise if all the entire train was in the dark it was the driver who didn't turn them on, if the train loses its secondary power circuit the lights will switch to battery automatically.
Odds on driver took the train from the shed in Bray and didn't switch the lights on, last train I heard of this happening to also started from Greystones early in the morning
And yes it is a safety issue
Quote:
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6.6.12.1. Passenger compartment lighting should remain operational at all times in normal operation.
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Did someone ask the driver to turn the lights on in Bray, the Dalkey tunnel isn't fun in the dark either.