Blue railway signals?

"Fred Johnson" wrote in message
news
On Thu, 13 Dec 2018 23:43:41 -0000, Rod Speed
wrote:



"Fred Johnson" wrote in message
news
On Thu, 13 Dec 2018 23:12:50 -0000, Rod Speed
wrote:



"Fred Johnson" wrote in message
news On Thu, 13 Dec 2018 21:03:57 -0000, Mike Humphrey
wrote:

Fred Johnson wrote:

Can anybody else remember blue traffic lights on railways? Can't
find
any evidence on google. I'm sure whereas cars have red/amber/green,
railways always had a 4th blue light. What does it mean and why has
it
disappeared from Google?

Railway signals in modern times have always had red, yellow (not
amber)

I've never been fussy enough to even notice the difference between
yellow,
amber, orange. I could tell the difference if they were side by side,
but
I just think of a road traffic light as either yellow or orange. I
couldn't even tell you what amber colour is compared to yellow and
orange.
I don't do things like "mauve", etc. Just purple, light purple, etc.

and green. A four-aspect signal has two yellows - the sequence
approaching a stop signal goes G, YY, Y, R. There can be a number of
other indications as well as the main signal but these are almost
invariably white.

I assume this is to allow trains the longer stopping distance they
require
than road vehicles.

There's a number of uses for blue and purple, but not appearing with
the
R/Y/G "traffic light" signals, at least in the UK.

I might be thinking of non "traffic light" signals, or I might be
thinking
of a light which was off and was just seeing the blue lens which had a
yellow light behind to make green.

If you want to look
at the full range of signs and signals, http://www.railsigns.uk/ has
a
very comprehensive guide.

That's a lot for a driver to remember! At least with road signs the
symbol is meaningful.

I wonder why the red is at the bottom on rail lights and the top on
traffic lights?

Basically because when there are two ways of doing
something, you can be sure someone will do it both ways.

Like my bloody French car which has the wiper switch going down to
increase speed.

And with light and power switches in houses etc.

Down should always be on

The yanks feel otherwise.

(except two or more way switches of course).

And then some bugger shows up who decides to do
them sideways so there is no confusion at all, and we
end up with 4 different ways of doing it instead of just 2.

Never seen a sideways lightswitch in a house.

But you do see it with power switches.

Anyway with automatic ones, there are no switches.

There are in mine.

And with whether hot and cold taps have the
hot one on the right of the pair or the left.

I can never remember which way round mine are, until I go to use one.
Because when I use one in another house that's the other way round, I
always get it wrong.

Never had any other car that way round.

Yeah, the frogs are much worse for that than most.

They even speak backwards, putting the noun before the adjective.

And some buggers even write backwards.

Like I said, whenever there is more than one way to do it,
you can be sure some will do it one way and some the other.

Every time I try to turn on the wipers, I'm pushing it the wrong way.
One day I'll snap it off.

"Steve Walker" wrote in message
news
On 13/12/2018 23:12, Rod Speed wrote:


"Fred Johnson" wrote in message
news
On Thu, 13 Dec 2018 21:03:57 -0000, Mike Humphrey
wrote:

Fred Johnson wrote:

Can anybody else remember blue traffic lights on railways? Can't find
any evidence on google. I'm sure whereas cars have red/amber/green,
railways always had a 4th blue light. What does it mean and why has
it disappeared from Google?

Railway signals in modern times have always had red, yellow (not
amber)

I've never been fussy enough to even notice the difference between
yellow, amber, orange. I could tell the difference if they were side by
side, but I just think of a road traffic light as either yellow or
orange. I couldn't even tell you what amber colour is compared to
yellow and orange. I don't do things like "mauve", etc. Just purple,
light purple, etc.

and green. A four-aspect signal has two yellows - the sequence
approaching a stop signal goes G, YY, Y, R. There can be a number of
other indications as well as the main signal but these are almost
invariably white.

I assume this is to allow trains the longer stopping distance they
require than road vehicles.

There's a number of uses for blue and purple, but not appearing with
the
R/Y/G "traffic light" signals, at least in the UK.

I might be thinking of non "traffic light" signals, or I might be
thinking of a light which was off and was just seeing the blue lens
which had a yellow light behind to make green.

If you want to look
at the full range of signs and signals, http://www.railsigns.uk/ has a
very comprehensive guide.

That's a lot for a driver to remember! At least with road signs the
symbol is meaningful.

I wonder why the red is at the bottom on rail lights and the top on
traffic lights?

Basically because when there are two ways of doing
something, you can be sure someone will do it both ways.

I am sure that I remember reading that it was based upon upper-quadrant
semaphore signalling, where a raised signal was "off" (clear) and
horizontal one was "on" (danger). Although both upper and lower quadrant
signals were used in the UK, they were almost all UQ (except on GWR lines)
from the 1920s - with the advantage that broken cables or heavy snow
caused them to drop to danger rather than the clear of LQ ones. They
simply copied UQ practice, so the top was clear and the bottom danger.

That doesn't explain why street traffic lights reversed the order with just
lights.

On 13/12/2018 16:57, Steve Walker wrote:
On 13/12/2018 16:42, Fred Johnson wrote:
Can anybody else remember blue traffic lights on railways?Â* Can't find
any evidence on google.Â* I'm sure whereas cars have red/amber/green,
railways always had a 4th blue light.Â* What does it mean and why has
it disappeared from Google?

Never heard of it.

4 (& 5)-aspect signals have always had red, green and two ambers as far
as I know.

I know that the semaphore signals had lenses that were red and blue, but
they definitely showed as red and green when lit from behind by
yellowish oil lamps at night.

SteveW

No, Blue was never part of railway standard signals. I am very hazy but
ISTR two amber - sequnec being green-two amer - one amber - red as the
obstruction was approached..

ISTR blue was something one saw on te railways but it wasn't part of the
standard signals


--
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On Fri, 14 Dec 2018 00:38:25 +0000, Steve ******, an especiall mentally
handicapped, troll-feeding, senile idiot, blabbered again:



The Ladbroke Grove rail crash, signal SN109?

That unwashed Scottish ******'s cock seems to be really irresisitible to all
you senile idiots, eh? Does it taste of "youth" to you idiots or what? YUCK!
LOL

On Fri, 14 Dec 2018 11:55:55 +1100, cantankerous trolling geezer Rot Speed,
the auto-contradicting senile sociopath, blabbered, again:

FLUSH another 118 line of the two prize idiots' absolutely idiotic drivel

--
Another retarded "conversation" between Birdbrain and senile Rot:

Senile Rot: " Did you ever dig a hole to bury your own ****?"

Birdbrain: "I do if there's no flush toilet around."

Senile Rot: "Yeah, I prefer camping like that, off by myself with
no dunnys around and have always buried the ****."

MID:

On Fri, 14 Dec 2018 11:59:30 +1100, cantankerous trolling geezer Rot Speed,
the auto-contradicting senile sociopath, blabbered, again:


caused them to drop to danger rather than the clear of LQ ones. They
simply copied UQ practice, so the top was clear and the bottom danger.

That doesn't explain why street traffic lights reversed the order with just
lights.

I'm sure you and Birdbrain can keep "discussing" it over for the next days
again! VBG

--
Another typical retarded conversation between our two village idiots,
Birdbrain and Rot Speed:

Birdbrain: "You beat me to it. Plain sex is boring."

Senile Rot: "Then **** the cats. That wont be boring."

Birdbrain: "Sell me a de-clawing tool first."

Senile Rot: "Wont help with the teeth."

Birdbrain: "They've never gone for me with their mouths."

Rot Speed: "They will if you are stupid enough to try ****ing them."

Birdbrain: "No, they always use claws."

Rot Speed: "They wont if you try ****ing them. Try it and see."

Message-ID:

Yes I think that is where the confusion came from actually. So many people
have colour blindness that blue is normally avoided.

Brian

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"Steve Walker" wrote in message
news
On 13/12/2018 16:42, Fred Johnson wrote:
Can anybody else remember blue traffic lights on railways? Can't find any
evidence on google. I'm sure whereas cars have red/amber/green, railways
always had a 4th blue light. What does it mean and why has it disappeared
from Google?

Never heard of it.

4 (& 5)-aspect signals have always had red, green and two ambers as far as
I know.

I know that the semaphore signals had lenses that were red and blue, but
they definitely showed as red and green when lit from behind by yellowish
oil lamps at night.

SteveW

On 13/12/2018 21:21, Fred Johnson wrote:
....
I wonder why the red is at the bottom on rail lights and the top on
traffic lights?

On railways it is at the bottom so that there is no light shade below
it, on which snow could build up and obscure the light.

--
--

Colin Bignell

Nightjar wrote
Fred Johnson wrote

I wonder why the red is at the bottom
on rail lights and the top on traffic lights?

On railways it is at the bottom so that there is no light shade
below it, on which snow could build up and obscure the light.

So why didn't that continue with street lights ?

On 14/12/2018 00:20, Fred Johnson wrote:
On Thu, 13 Dec 2018 23:43:41 -0000, Rod Speed
wrote:
"Fred Johnson" wrote in message
news
On Thu, 13 Dec 2018 23:12:50 -0000, Rod Speed
wrote:

Basically because when there are two ways of doing
something, you can be sure someone will do it both ways.

Like my bloody French car which has the wiper switch going down to
increase speed.

And with light and power switches in houses etc.

Down should always be on (except two or more way switches of course).

USA

And then some bugger shows up who decides to do
them sideways so there is no confusion at all, and we
end up with 4 different ways of doing it instead of just 2.

Never seen a sideways lightswitch in a house.

Japan

And with whether hot and cold taps have the
hot one on the right of the pair or the left.

Usually hot is on the left.

--
Max Demian