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Richard J.[_3_] · July 8th 11, 11:14 PM posted to uk.transport.london

wrote on 08 July 2011 23:30:34 ...
In ,
(Basil Jet) wrote:

On 2011\07\08 14:12, Northolt Park Gates wrote:
On Jul 8, 1:40 am, Basil wrote:
It turns out that for Saturday and Sunday, the District Line is shut
from West Kensington to Ealing / Richmond, and the North London Line
is shut from Willesden to Richmond. Since these three services are
the only three serving the Chiswick Park / Gunnersbury area, I'm
wondering if it was necessary to shut all three at the same time,
when no track or structure is used by more than two.

Could be that all three services share the same metals at some
point?

I just said that they don't. They could conceivably share the same
power section, although it would be very poor design if they did.

What about the signalling?

Separate LU and Network Rail systems. Neither affects all three
services. The same is true of the power systems which are separated by
a gap on the District just west of the Acton Lane bridge on the Richmond
branch.

Also, what about where the District passes over the NLL at Acton?

I don't believe they are working on the bridge structure itself. I
suppose it might be a Health & Safety risk if they are doing track
renewal on the bridge (bits falling off on to the NLL below?), but in
that case they should run the NLL to South Acton instead of cutting it
back to Willesden Junction.
--
Richard J.
(to email me, swap 'uk' and 'yon' in address)