This railway map is not 100% complete. It's probably great at what it does do, but I happen to know of a very minor side-side-side line that isn't on it.
This one:
https://en.wikipedia.org/wiki/Bristo...merset_Railway
Which featered this item:
https://en.wikipedia.org/wiki/Pensford_Viaduct
If it was known about and omitted for reasons of irrelevance, then I quite understand, but if it is not there because nobody knew, I thought it should be mentioned.