"Paul Corfield" wrote in message
...
On 19 Jul 2005 12:38:38 -0700, "mtveurope" wrote:

by the way... if they only have problem with the cables why does circle
will be working soon? does that line don't have cables? (I know it's
not so close to the train, but they're still there, don't they?

I have not seen any detailed information but both of the Circle Line
bombs took place in wider tunnels and the trains are of a different
profile to those of the Picc Line. Therefore the outward effect of the
explosions would seem to be less. As there is more space in the sub
surface tunnels then it is possible that there is less cable damage. All
tube lines have a range of cables running alongside to provide
telephone, communication, signalling and power supplies. The amount of
cabling is potentially more complex at junctions and all of the
explosions took place near junctions or crossovers so there is a clear
need to be careful in clearing / cleaning / repairing the sites so that
more damage is not caused in the short run.

Yes, the cable run suffered from extensive damage. Don't forget that even
once the signalling cables have been replaced, extensive testing needs to be
carried out to ensure the rewiring is done correctly. Luckily, most of
Aldgate was resignalled during the late 1980s so the diagrams should be
available.

In article , Robin Mayes
writes


Yes, the cable run suffered from extensive damage. Don't forget that even
once the signalling cables have been replaced, extensive testing needs to be
carried out to ensure the rewiring is done correctly. Luckily, most of
Aldgate was resignalled during the late 1980s so the diagrams should be
available.



Having recently retired from a life time of supporting, modifying and
replacing 'legacy' IT systems allow me to express some doubt. Most
'legacy' IT systems are less than ten years old and their documentation
invariably leaves much to be desired, no matter how good it was when the
system was implemented.

The two pointers that I can see to suggest there might be problems are
age and the fact that responsibility for maintenance has been
transferred to an out-sourcing company. When ever a transfer takes
place, there is a dreadful tendency to 'rationalise' documentation and
in so doing loose the essential data.

--
Nicholas David Richards -

"Où sont les neiges d'antan?"