That
NR» page refers to "capabilities", which can be read as features you could observe in the future railway. But I don't think that's what they really mean - it's more about the areas of work within this "Rail Technical Strategy". So it's the work within those areas that ought to produce more concrete proposals for how to change things.
Maybe. I did wonder if a list of that kind from 30 years ago would be any different, and I suspect the answer is "not much". I had a quick look for such an article, and perhaps unsurprisingly didn't find one. But I did find
this piece on Londonist, which is about predictions made in 1988. It's different in that it's about London Transport, and is more focused on concrete proposals, so most of them are new tube lines. But it is interesting nonetheless, and it concludes that half of the proposed schemes happened, though with some changes as you'd expect.