In message
, at
12:36:40 on Sun, 17 May 2009, Mr Thant
remarked:
"The plan is to have the SCL station platform tunnel primary lining
completed in advance of the arrival of the running tunnel TBMs. This
will allow the tunnel boring machinery to be slid through the
completed platform tunnels and re-start the running tunnel drive to
the next station."

If that's the new plan, it differs from the one posted earlier today,
which describes the kind of discontinuity at the station that I was
assuming they would be trying to avoid:

"The tunnel drives westwards to Stepney Green are commenced from the
crossover area at the western end of the Isle of Dogs station box.
Assembly of the TBM will take three months at this location, with the
subsequent drive to Stepney Green taking ten months. Additionally, the
Isle of Dogs station box will be broken through at its eastern end by a
TBM completing its drive from the east, having been launched from
the Limmo Peninsula nine months previously. This TBM would then be
disassembled within the Isle of Dogs station box."
--
Roland Perry