On Fri, 29 Oct 2004, Roland Perry wrote:

In message ,
at 20:28:53 on Thu, 28 Oct 2004, Tom Anderson
remarked:

But how do you know whether a map is accurate? That you can evaluate
them implies that you have some sort of authoritative source of
knowledge about the routes - which is what i'm after!

Maps like that have to be pieced together from a wide range of sources.

That's what i was afraid of. The 'map' i'm after only exists inside the
minds of a few people who've spent years accumulating tube lore.

For example, the W&C map I posted a link to. An earlier in the year
there was a long discussion about the approaches to Morden (another
place where there's been a "joining the dots" rather than accurately
depicting the route). I've got some other original maps of the Northern
as it crosses the Thames. Others have spoken of the Piccadilly near
South Ken, and the Jubilee north of Baker St being formerly Bakerloo
makes the right-angle crossing shown rather implausible. I don't see a
huge bend at Bank-Central, which one observes when on the train. And so
on. Lots of little things to put together, each of which will improve
one small part.

I see. I suppose i'll just have to keep reading and learning.

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!

tom

--
.... to build a space elevator, that's got to be hundreds of thousands of
pounds ... -- Mike Froggatt