"Richard J." wrote in message
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*In* the Thames?? Do you mean near the Thames, e.g. on the riverbank?

Being something of a perfectionist I most certainly meant "In"! All three
railways had stages/piers built out some distance from the bank from where
shafts went down to the level of the tunnel. The C&SLR's was slightly east
of London Bridge, near Swan Lane Pier, at the south end of Swan Lane. The
W&CR's were slightly east of Blackfriars Bridge, and the B&SWRs was slightly
east of Hungerford Bridge.

There are certainly substantial tunnel-level remains of the Swan Lane shaft;
can't remember for the other two.