Why not just volunteer at these railroads and determine for yourself which ones are "worth while efforts" and which ones are "ill considered?" Talk to the volunteers and see what kind of vibe they give off.
If you are a "volunteer," you are not wedded to any institution, and can leave whenever you want.
This sounds like good advice.
I once offered to volunteer at a RR-related operation. I won't say when or where this was but I got a horrible reaction. They did everything short of saying, "Well, we don't really need people but if you ask real nicely, we might let you take tickets at the platform and sweep up after us." They did actually mention sweeping was called for.
They also specifically told me to "give up on the dream of being an engineer", as they had people for that already. This was before they knew if I had any RR experience at all (in fact, they never even asked). I could have had Hot Water's level of experience for all they knew. Mind you, I was in my 30s, in excellent shape as I was an Army officer at the time, and presented myself professionally, if I do say so myself. they weren't staring at an overweight, pimply foamer type with bad hygiene and manners to match.
I've never suffered fools well, so as I turned to walk away, I said as calmly as I could, "I'm sorry I wasted your time by asking if you needed any help. For what it's worth, you might want to ask questions of the backgrounds in the future for anyone who might be foolish enough to ask if you need volunteers, because you never know what experience base you could be missing out on," and I then left without another word. I never went back there, even to ride as a paying customer.
Not every museum is like that, of course, but I have found in life that for the most part, your first impression is actually a decent gauge of how an organization really is.
In this day and age where the youth simply won't show up the second day if they get the reception I got, some of these museums can't exist into the future with an attitude like that.