The Canadian National Post really do know how to get a subtle message across.
They created a set of printable subway etiquette posters for the Toronto Transit Commission, where, apparently, people don't know any better.

I think that poster can apply quiet easily to the Irish public transport system as well.
If you would like to print out your own copy of this poster you can find them
here.
Also, spot the name of the journalist who wrote that article
National Post.
I SWEAR I wasn't googling my own name.Honest