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David C[_2_] · October 17th 15, 12:52 PM posted to uk.transport.london

On Fri, 02 Oct 2015 17:30:29 -0500,
wrote:

In article ,
(David C) wrote:

On Fri, 02 Oct 2015 06:26:29 -0500,
wrote:

In article ,
(Paul Corfield) wrote:

On Wed, 30 Sep 2015 19:55:10 -0500,
wrote:

Trouble is that there are two electrification systems at Barking.
Platform 1 isn't ideally situated for overhead electrification.

What? You can see on Google satellite view that the tracks into
Platform 1 are not electrified. Given that overhead electrification
sits perfectly well beside 4th rail LU electrified tracks at Barking I
don't see what the problem is in stringing wires into that platform as
part of GOBLIN electrification.

Please feel free to tell me what I've missed.

I'm not saying it can't be done but it is a lot more complicated to
signal so tends to be avoided. The LUL 3rd & 4th rail electrified tracks
lie between platform 1 and the overhead electrified tracks, don't they?
So the Barking Riverside route won't go near platform 1 so why keep it
in service?

Sorry but you are not making any sense.

As has been mentioned, 25 kV AC electrification has co-existed with
the under-ground since 1962without any problems.

Not on the same tracks. And 1960s signalling technology wasn't based on
electronics. That is more picky. As I said, why was most of the North London
converted to 25KV?

To allow access for Eurostars to reach the GN, & electric freights to
run from the GE to the West Coast ML?

As for the old LTS signalling, it was replaced in 1996 when Upminster
IECC went operational.

(Back in the past, LT& BR shared tracks between Bromley by Bow, but
that is no longer the case, there is no physical connection between
the two systems.)

Wiring platform 1 "might" have clearance problems, but single trolley
wire OHE is all that is needed there, & the only signal that would
require immunisation is the platform starter.

The up / down cross-over is already wired, so this should be a cheap
(!) & simple project.

As for why, Mr. Corfield has already pointed out that a wired turnback
with a platform face just might be useful, & maybe it might not be
possible to path the whole Goblin service to Barking Riverside through
the the platform 7 & 8 bottl-neck at Barking Station.

I suppose it might be possible but the immunisation work might make it poor
value for money. That was my point.

What immunisation work?

One signal might need work, but the two systems seem to co-exist side
by side without any obvious problems, even at Upminster where the LUL
tracks are flanked by two separate 25kV installations!

(The LTS mainline & the Upminster - Romford branch.)

As for value for money, does the Goblin scheme include any of the
possible junctions with existing 25kV routes, such as to the GN at
Harringay, or the Midland / Thameslink connection from Junction Road
Junction?

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