Impressive stuff!
It's interesting to look at how things have changed like that. Up till 1995, everything is more or less smooth and organised. Then with the privatisation era, it goes completely bonkers and all over the place. Not a criticism at all. Quite the opposite. I like the way that is shown
My only request would be to have notes on the left side to say what line is what. Such as "Scotland, Central England, South England, Wales, South West" or However it works.
i can see that's pretty much how it is organised but it's a bit puzzling trying to work that out when skimming through

Not sure how simple it is to do such. But it would be interesting to see what companies stemmed from the LNER lines for example
Again though, impressive stuff! Thanks for sharing.