what about before NR banned flailing from their tracks then? lets ask a driver on here if they get scared by people flailing from carriages.
sure some may have had a suicide but don't forget that drivers can see whats coming up ahead of them. railtours aren't hard to find. there's at least 1 each saturday. When they see that it's a railtour by the distinctivenss of the coaching stock they assume that it's a charter/railtour with enthusiasts aboard and can expect people with heads out.
anyway, what's worse to loose, an arm or a head?
think about it
When they are going 125 up the WCML on the fast & your gently rolling along at 70 on the slow "flailing" (More like f'ing about with your life) on the right handside.[1]
Bang & your dead.
[1] - Just a possible scenario.