"Mark Brader" wrote in message
...

The lines swap vertically between
Chancery Lane and St Pauls, IIRC.
What is the reason for this?

This one *is* due to a narrow street above.

I don't understand, since the do-si-do clearly occupies a larger footprint
than would two tunnels running above each other.

--
John Rowland - Spamtrapped
Transport Plans for the London Area, updated 2001
http://www.geocities.com/Athens/Acro...69/tpftla.html
A man's vehicle is a symbol of his manhood.
That's why my vehicle's the Piccadilly Line -
It's the size of a county and it comes every two and a half minutes