About a month since I wrote the above piece, and still no official action apart from "encouraging" people on public transport to wear face coverings. Meanwhile even the the dithering UK authorities have made masks compulsory on public transport.
On-one from Irish Rail has had anything to say and the head of the hopeless NTA still merely "advises". Maybe the medics, who are the real government at the moment never stoop to use public transport.
Any views from real rail users?