Wasn’t even prospective, preventative action. There was pretty rash series of decapitations/fatalities in the past decade of people who think sticking their head out of a moving train is risk free that lead to this ruling being made mandatory.
They kicked off claiming it would ruin the ambience, but really it cost a very pretty penny.
They’d do anything to save a few quid; it’s amazing how they used to get cheap oil lube and coal from Russia, and since the war they’ve miraculously been managing to procure the same rates from new companies that have appeared overnight/moved production to sanction-less countries just over the border like Latvia, Lithuania, Kazakhstan etc.