There is risk everywhere, statistically speaking walking down the stairs is a risky activity, and I`m not joking here. TBH crossing the road opposite my houses is probably more dangerous than walking round the average Heritage Railway shed, and I
I know there's risk everywhere, and yes, crossing the road is dangerous. Yes, walking down your stairs is dangerous. But in saying that, I think you're completely missing the point, and being deliberately obtuse. Both you and others have a responsibility for safety, whatever you're doing. This argument is saying "I should be allowed to do whatever I want, because other things are also dangerous", which is utterly fecking stupid, if you'll excuse the language. You generally need to cross roads to live your everyday life. You don't need to walk around functioning railway depots to do so.
In case you haven't noticed, a huge amount of effort has gone into making cars safer, and the UK now has some of the safest roads in the world, partly because the UK driving test is notoriously difficult compared to a lot of others.
Safety is not some passive thing, it has to be very thoroughly designed in everywhere. That's why the last fatality in a train crash in the UK was nearly twelve years ago, the longest period without one in the industry's entire history. That's not just luck, it's decades of hard work by dedicated people who are absolutely determined to make sure that no-one dies on their watch. As someone who has been involved in that, I find your trivialising and rubbishing of health and safety quite insulting, immature and selfish.
Your reasoning for why this somehow shouldn't apply to the heritage sector makes no sense at all. I pay my dues to a heritage railway, and besides a couple of free tickets each year, I get nothing directly back, certainly not any of the rights you seem to think that should come with it. Why do I contribute? Because I support what they're doing, and want to ensure it survives for others to see and enjoy, as I have.
I'm not going to apologise for spoiling your fun here.
In my mid-teens, I went through a phase of shed-bunking, which seemed like a huge amount of fun at the time, especially when me and a bunch of other kids got up-close-and-personal to 91001 in Bounds Green depot just after it was delivered. Yes, it was fun, but looking back now, I realise I had exposed myself to horrific danger crossing live tracks, and I could have ended up in tiny pieces. It's no surprise depot access is so much more strictly controlled these days, and if my kids did the same thing, I'd (metaphorically) thrash them to within an inch of their lives for being so bloody stupid.
Heritage railways are just as dangerous as "real" ones, and if you're not properly trained with a specific job to do, the working areas should be off-limits.