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.

There will be important issues to consider in what is restored in what
order to ensure a logical and safe approach is taken, that the
infrastructure is in a resilient state and that the safety regulators
can be confident on behalf of the public that the railway is safe to
reopen. People will naturally be concerned / nervous about travelling
over the bombed sections of line so a fully safe and reliable railway is
needed to provide reassurance to London's tube users.

Although I can be accused of being biased as I work for LU I think the
progress thus far has been very good in trying circumstances. I look
forward to having the railway back and working properly. People need to
be patient even though I can understand why people may be getting
"hacked off" with disrupted journeys and overcrowding.

--
Paul C


Admits to working for London Underground!

It took almost 1 year to the day for the #1 train to run under the WTC
site.

The other WTC stations World Trade Center on the E & Cortlandt St on
the N R & W are on the outskirts of WTC while the 1train was in the
center of WTC.

Ironically as a life long NYer i was not in NYC on 9/11 but was at
Heathrow
on 7/7.

In message .com, at
14:22:07 on Tue, 19 Jul 2005, remarked:
It took almost 1 year to the day for the #1 train to run under the WTC
site.

A rather different kind of damage.

I agree with some earlier posters that the Northern Line incident at
Camden Town (where a train hit the tunnel wall at a junction) seems to
provide the most realistic equivalent. And don't forget that the Central
Line train that derailed (at Chancery Lane?) damaged the tunnel and
platform in the process. How long did that take to repair (rather than
understanding what was wrong with the trains)?
--
Roland Perry

Roland Perry wrote:

I agree with some earlier posters that the Northern Line incident at
Camden Town (where a train hit the tunnel wall at a junction) seems to
provide the most realistic equivalent. And don't forget that the Central
Line train that derailed (at Chancery Lane?) damaged the tunnel and
platform in the process. How long did that take to repair (rather than
understanding what was wrong with the trains)?

Hello,

As a matter for comparison, I remember that it took more than two weeks
after July 16, 1995 (when a bombing killed 8 and injuried 50 at
Saint-Michel station on RER B line of Paris transit system) to get
normal service.

Note that Saint-Michel station is built on the *very* model of a deep LU
station: two tubes and central escalators. Even the walls opposite the
platform look like a London Underground station. One could excpect to
hear Stand Back, Train Approaching... As a difference, it has mainline
gauge and overhead supply.

Stanislas, who is very upset by this series of bombings - but those
won't deter me from coming to London next week!

--
inversez "kertanguy" et "de" pour me joindre

In article 1h032if.vzt4wpkh00g0N%stanislas.kertanguyde@lapos te.net,
(Stanislas de Kertanguy) wrote:

Roland Perry wrote:

I agree with some earlier posters that the Northern Line incident at
Camden Town (where a train hit the tunnel wall at a junction) seems
to
provide the most realistic equivalent. And don't forget that the
Central Line train that derailed (at Chancery Lane?) damaged the
tunnel and platform in the process. How long did that take to repair
(rather than understanding what was wrong with the trains)?

As a matter for comparison, I remember that it took more than two weeks
after July 16, 1995 (when a bombing killed 8 and injuried 50 at
Saint-Michel station on RER B line of Paris transit system) to get
normal service.

Note that Saint-Michel station is built on the *very* model of a deep
LU
station: two tubes and central escalators. Even the walls opposite the
platform look like a London Underground station. One could excpect to
hear Stand Back, Train Approaching... As a difference, it has mainline
gauge and overhead supply.

In fact the Piccadilly bomb was in the worst possible location, in a
running tunnel barely larger than the train so the blast was as
confined as possible. Even in a tube platform the blast would have been
a lot less concentrated.

Stanislas, who is very upset by this series of bombings - but those
won't deter me from coming to London next week!

Bienvenu!

--
Colin Rosenstiel

"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?"