Quite honestly, I don't see the problem here. It's a railway line, stay the off of it, common sense, no matter how uncommon.
I think there is a attitudinal issue here .. in continental Europe people are used to this and stay out of the way, yet in other parts we have an issues with pedestrians, cyclists, motorists doing their damned best to get run over despite signs, bells, barriers, fences, that being the case, you're not going to stop them no matter how much you do.
Just clean up the mess and try to get back on schedule. I don't have a lot of sympathy for this degree of stupidity except where animals and children are involved, keep them at a distance, put brakes on your strollers (or your hands for that matter) and stop tying poor animals to the tracks at the top of the Glanmire tunnel!
Thank God we're in the letting off steam section , I suppose. I don't like a lot of the modern stuff but I do admire a well built efficient transit system, nice video Ernie