In article ,
Richard J. wrote:
Nothing. In fac rumour has it that the white aspects are going to be
replaced with blue aspects, to match the blue aspects to be used on
the VLU signalling.

VLU?

Victoria Line Upgrade, as a complete guess.


--
I don't play The Game - it's for five-year-olds with delusions of adulthood.

TheOneKEA wrote:

Nothing. In fac rumour has it that the white aspects are going to be
replaced with blue aspects, to match the blue aspects to be used on the
VLU signalling.

Buuut...If you do that, then they could be confused with lamps
associated with tripcock testers. Fun eh?

Article on signalling on the Central Line, penned by one Clive Feather:
http://www.davros.org/rail/signalling/articles/central.html

Cheers,

Barry

White was originally chosen for the Victoria Line which was completely in
tunnel, as far as this signalling was concerned, and white was not
considered as a problem in this situation. It basically meant that a train
in ATO had authority to pass it whereas a manually operated one did not.
The Jubilee Line simply extended this principle as did the Central Line.

The Vic Line had unilluminated headway boards (viewed by the train lighting)
which simply told the driver that the train had stopped for signalling
purposes due to a train in front. Signals were provided where there was a
need to protect converging routes or inform the driver of diverging routes.
They were also supplied (as headwall corner signals) as starters on every
station. This allowed a degraded mode of operation if a train could not be
driven in ATO. If the train was in ATO the driver could press the start
buttons with a white displayed on the signal, but manual operation had to
wait for the green.

Hindsight is a useful tool, but tripcock testers were supposed to display a
purple/blue light and the white light on the Vic was most likely to be met
under manual driving conditions (as opposed to ATO where the train would
just pass the aspect as required) by ballast/works trains coming on or off
the line - use of an aspect colour to mean different things during a journey
could have caused confusion. Many ATO equipped railways around the world
now use blue and/or maltese cross for this aspect.

BTW - did you know that the original signal aspects on main line railways
were white for clear and red for stop or caution (distants were not well
differentiated in the early days). I do not know when the green aspect
became the standard, but suspect that it was in the early years of the
twentieth century as electric lighting external to the railway became
common. I have an 1896 L&YR rule book which only quotes white and red.

Peter
--
Peter & Elizabeth Corser
Leighton Buzzard, UK
"Boltar" wrote in message
oups.com...

wrote:
It wasn't appropriate to use yellow, as on traditional signalling
systems that would indicate to the driver that he was clear to the next
signal.

They should have chosen something other than white though. If theres
any colour that could be confused at a distance with lots of other
normal
lights nearby its a white. What was wrong with blue or purple for
example?

B2003




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"Barry Salter" wrote in message
...
TheOneKEA wrote:

Nothing. In fac rumour has it that the white aspects are going to be
replaced with blue aspects, to match the blue aspects to be used on the
VLU signalling.

Buuut...If you do that, then they could be confused with lamps associated
with tripcock testers. Fun eh?

Article on signalling on the Central Line, penned by one Clive Feather:
http://www.davros.org/rail/signalling/articles/central.html

Cheers,

Barry

Why not "flashing" yellow?

MaxB

In message , Barry Salter
writes

Nothing. In fac rumour has it that the white aspects are going to be
replaced with blue aspects, to match the blue aspects to be used on the
VLU signalling.

Buuut...If you do that, then they could be confused with lamps
associated with tripcock testers. Fun eh?

Other than white is also a valid TCT colour too , depending on the
location.
--
Steve Fitzgerald has now left the building.
You will find him in London's Docklands, E16, UK
(please use the reply to address for email)

Steve Fitzgerald wrote:
In message , Barry Salter
writes

Nothing. In fac rumour has it that the white aspects are going to be
replaced with blue aspects, to match the blue aspects to be used on
the VLU signalling.

Buuut...If you do that, then they could be confused with lamps
associated with tripcock testers. Fun eh?

Other than white is also a valid TCT colour too , depending on the
location.

Bloody hell, yet another TLA. Whats TCT then?

And we've only had a "guess" so far that VLU is Victoria Line Upgrade. If
that's right, why is the Victoria Line changing to blue after nearly 40
years of white?
--
Richard J.
(to email me, swap 'uk' and 'yon' in address)

On Thu, 16 Nov 2006 21:02:37 GMT, "Richard J."
wrote:

Steve Fitzgerald wrote:
In message , Barry Salter
writes

Nothing. In fac rumour has it that the white aspects are going to be
replaced with blue aspects, to match the blue aspects to be used on
the VLU signalling.

Buuut...If you do that, then they could be confused with lamps
associated with tripcock testers. Fun eh?

Other than white is also a valid TCT colour too , depending on the
location.

Bloody hell, yet another TLA. Whats TCT then?

Given the context - trip cock tester

And we've only had a "guess" so far that VLU is Victoria Line Upgrade. If
that's right, why is the Victoria Line changing to blue after nearly 40
years of white?

Yes VLU is Victoria Line Upgrade.

And in JNP land we have JNUP which is Jubilee and Northern Upgrade
Project.

I don't know if we have an "official" abbreviation for the Sub Surface
upgrade - haven't heard one yet.
--
Paul C


Admits to working for London Underground!

On Thu, 16 Nov 2006 21:17:59 +0000, Paul Corfield
wrote:

I don't know if we have an "official" abbreviation for the Sub Surface
upgrade - haven't heard one yet.

WHFO?

In message , Richard J.
writes

Nothing. In fac rumour has it that the white aspects are going to be
replaced with blue aspects, to match the blue aspects to be used on
the VLU signalling.

Buuut...If you do that, then they could be confused with lamps
associated with tripcock testers. Fun eh?

Other than white is also a valid TCT colour too , depending on the
location.

Bloody hell, yet another TLA. Whats TCT then?

Ahem, as sir will note above, a Tripcock Tester?
--
Steve Fitzgerald has now left the building.
You will find him in London's Docklands, E16, UK
(please use the reply to address for email)

In article ,
(James Farrar) wrote:

I don't know if we have an "official" abbreviation for the Sub
Surface
upgrade - haven't heard one yet.

WHFO?

WTFC?

--
Paul Cummins

**FREE** mobile phones, with FREE line rental
http://www.gstgroup.co.uk/