Bear in mind also that the existing stations (except Canada Water,
which is of recent construction) will require to be upgraded to be DDA
compliant, which at Shadwell, Wapping and Rotherhithe, for example,
will require new lifts and cross-passageways. (Surrey Quays is a
surface station in a cutting, but this will probably require lifts as
there is little space for ramps.) I also suspect that the narrow
platforms at Wapping will have to be widened, which will involve
widening the tunnel - a major civil engineering task in its own right.
In addition, platforms will require to be lengthend, which at
Rotherhithe and Wapping will require opening out the tunnels (the new
class 378s will, I presume, be 20m vehicles whereas the A stock is
noticeably shorter).

Are lifts going in at these stations as you indicate? I was not aware
of such a plan. I also wasn't aware of any widening work, although
again I may be wrong.

Tom