London Banter - View Single Post

Richard J.[_3_] · July 9th 11, 10:32 PM posted to uk.transport.london

wrote on 09 July 2011 01:50:06 ...
In ,
(Richard J.) wrote:

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.

Is there a reversing facility at South Acton?

Yes, there's a crossover north of the station, and south to north (down
to up) is a signalled move. At least it was before they lengthened the
platforms; haven't checked recently.

Interestingly, the National Rail site talks about "Engineering work
between Richmond and South Acton" but says that buses replace trains
between Richmond and Willesden Junction. That suggests to me that LO
decided to cut the service back to WJ even though Network Rail had the
line open down to South Acton.
--
Richard J.
(to email me, swap 'uk' and 'yon' in address)