On Sat, 26 Nov 2005 03:25:25 +0000, Tom Anderson
wrote:

On Fri, 25 Nov 2005, Boltar wrote:

Clive D. W. Feather wrote:

It's possible that the line was cut back to Warren Street - Walthamstow;
IIRC, Warren Street is the next crossover back.

Thank god the builders of the JLE had the forsight to put in lots of
crossovers so the nonense we have to put up with on other lines whereby
huge swathes of the line is closed simply because of a lack of
crossovers to reverse trains at is mitigated.

It's certainly a good thing that the JLE is built to a high level of
flexibility, but the Victoria line, which is what we were talking about
here, isn't actually that bad: you can reverse at Victoria, Warren Street,
King's Cross, Highbury & Islington and Seven Sisters, five out of the
line's sixteen stations!

Hmm. Can you actually reverse at H&I? There's a connection that should
allow it, according to the maps, but i've never heard of it happening.

Reversal at Highbury certainly is done - usually if the line is
suspended due to an incident south of there.

And can you reverse in both directions at Victoria, Warren Street and
Seven Sisters? Again, the tracks would allow it, but what about the
signalling? Or is it all done manually?

Victoria is principally a south to north reversal - either via the
sidings to the south or the crossover. In theory you could run a train
north out of the n/b and reverse back over the crossover into the s/b
but I've never heard of that being done.

Warren St is south to north. I've never heard of it being done in the
reverse direction.

Seven Sisters - typically north to south via the sidings / depot road.
If a train fails in the s/b platform they can and do reverse it back
into the sidings. You can't head south from the central terminating
platform, only to the depot / sidings. I've also never heard of a n/b
train having left the Walthamstow platform, heading north and then
reversing back into the central terminating track at Seven Sisters.

Whether the "rare" moves are prevented by the signalling set up I simply
don't know.
--
Paul C


Admits to working for London Underground!