In message
, MIG
writes

Heading across the viaduct, Charing Cross side of London Bridge
Station, one can see down to where they appear to have dug up Railway
Approach.

Four parallel arch or tunnel roofs seem to have been revealed just
below the surface.

Is this part of some former station structure, or is there some other
system of vaults below the road? Was this area part of a built-up
embankment, similar to the one on the other side of the river?

Could the arches have supported the horse ramp to the original London &
Greenwich terminus (bearing in mind that the ground level in the area
has risen progressively over the years? If so, they would be of great
archaeological interest. You can see the upper end of this ramp at:

http://upload.wikimedia.org/wikipedi...ge_viaduct.JPG

The other possibility is that they could be part of the foundations of
St Thomas's Hospital, before it was rebuilt next to Westminster Bridge -
the railway had to buy the hospital site (at enormous cost) when the
Charing X extension was built.
--
Paul Terry