On 13 Aug, 12:55, "DW downunder" noname wrote:
"Recliner" wrote in message

...





"DW downunder" noname wrote in message
. au
"Recliner" wrote in message
.. .
"David Cantrell" wrote in message
o.uk
On Wed, Aug 12, 2009 at 10:26:30AM +0100, Recliner wrote:

True, but the new Victoria line trains are longer, faster and more
frequent, so that may account for some of the extra power.

Longer? *When did the platforms get lengthened then?

The new Victoria line trains will be the longest on the LU network,
until the even longer new 8-car S stock trains enter service.
Presumably they just stop further into the tunnels.

But maybe answer the question: The '09 stock is longer than the 67
stock because the revised ATO is setup for a higher stopping
accuracy. That means that more of the available platform is actually
used, hence longer trains - not longer platforms. [BTW, as the trains
are in tunnel all the time they carry pax, "... stop further into the
tunnels ... " is a statement rather lacking in points of reference.]
Also, elimination of intermediate driving cabs increases the total
amount of space in the train made available to pax.

OK, stop further into the running tunnels, but you already knew what I
meant. But your other points do make sense.

Incidentally, they're 3m longer than the old trains, which were already
long by tube train standards. This might be another reason for them not
ever being expected to run in service on other LU lines.

Vic and Central were the only 8-car lines. With the Jubilee now 7-car
(longer cars) and platform doors, clearly no cascade path there. Central
Line has the additional central area restriction that presently leads to the
outer (3rd) current rail being mounted higher than on the rest of LU lines
and NR 3rd rail.

So it seems that any semblance of integrated fleet management across LU has
been abandoned for now. The '09 stock is IT for the Vic for the next 35-40
years unless it proves a lemon like the 83. Given the cautious steps towards
introduction, there's a chance it'll prove at least a grapefruit if not a
very nice juicy navel.

The only possibility is extra stock for the Central Line being built based
on the same development platform but to the more universal loading gauge
... *then if extra trains for the Vic were required at the same time, they
may be to that more universal spec. That could only happen if more trains
could be run on the Vic or some were damaged and needed replacing. More
trains probably means changes to the signalling - anybody want to vounteer
to be project manager? *

Original train formation/length doesn't seem to stop 1972 stock being
compatible with 1967 stock or 1992 stock running on the Waterloo &
City. Units can be reformed.