On 30 Jan, 23:29, (Mark Brader) wrote:
If you have an explanation, I'd like to see it, and the source.

The most detailed explanation I've seen is this one from a very
hardcore expert:
http://districtdave.proboards39.com/...e=1#1163453810

The gist is the tunnels were built in stages with no real plan, and it
was very late on that a decision was taken to make the tunnel with the
shallowest gradient up to King William Street the northbound one,
which also happened to be the one on the right crossing the Thames.

(btw a while ago someone on here asked where exactly the lines cross
back at the north end. Judging purely by the forces exerted on my
arse, the southbound crosses over the northbound immediately south of
Moorgate)

U

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