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#31
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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. |
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#32
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Blue railway signals?
"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. |
#33
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Blue railway signals?
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 -- "What do you think about Gay Marriage?" "I don't." "Don't what?" "Think about Gay Marriage." |
#34
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Troll-feeding Senile IDIOT Alert!
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 |
#35
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Lonely Psychotic Senile Ozzie Troll Alert! 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: |
#36
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Lonely Psychotic Senile Ozzie Troll Alert! LOL
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: |
#37
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Blue railway signals?
Yes I think that is where the confusion came from actually. So many people
have colour blindness that blue is normally avoided. Brian -- ----- -- This newsgroup posting comes to you directly from... The Sofa of Brian Gaff... Blind user, so no pictures please Note this Signature is meaningless.! "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 |
#38
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Blue railway signals?
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 |
#39
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Blue railway signals?
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 ? |
#40
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Blue railway signals?
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 |
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