In message ,
Tom Anderson writes

Perhaps if someone comes along and offers me a sabbatical (do grad
students get sabbaticals?), i'll take a year off to collate and digitise
every scrap of information available, then put together a definitive map.
Or persuade some geography student that it would make a good dissertation
project!

When the tube system is shown on a geometric map it is almost always
done in a way to assist users of the map to find routes. To do this it
is inevitable that a lot of fine detail has to be compromised in order
to maintain clarity.

--
Paul Terry