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Post by johnbrambling on Nov 29, 2021 20:53:27 GMT
In 2020 I photographed this signal at Rickmansworth.I know a bit about signals on Network Rail but LUL is a different world to me! Therefore, I'd appreciate a bit more information on the purpose this one serves and how old it is. I am guessing that it may have been installed when the electrification was extended to Amersham in the 1960s? Thanks in advance.  |
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Tom
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Signalfel?
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Post by Tom on Nov 29, 2021 21:03:57 GMT
It's effectively the same as an 'off' indicator on Network Rail - the difference being that LT gave a positive apsect for 'on' as well. Not sure of the date but I would envisage 1953 when Rickmansworth was resignalled.
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Post by tut on Nov 29, 2021 21:07:59 GMT
This is a platform repeater which exists to tell platform staff whether or not the starting signal is on or off if they cannot see it from where they should be standing. On means a signal is showing its most restrictive aspect. Off is the opposite of on, i.e. a signal is not showing its most restrictive aspect. In the case of a stop signal it means it's showing a proceed aspect (yellow, double yellow or green). www.railsigns.uk/sect20page1/sect20page1.htmlOn and off are harder terms to explain than they are to use. If a signal is on it basically means the signal control has not been operated and either you must stop at it, or (in the case of a repeater) you're gonna have to stop at the next signal. Off means the signal control has been operated for the train to proceed. Of course with multi-aspect signalling, shunt signals and so on there are many different types of off. The other slightly confusing thing is repeaters obviously cannot show a stop aspect or indication, so whether a repeater is on or off you won't have to stop at it. But if a repeater is on, the signal it repeats is on and you will have to stop at the next signal. If a repeater is off the signal it repeats is off, you are cleared to proceed. |
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Post by johnbrambling on Nov 29, 2021 22:19:16 GMT
Thanks for the replies. To elaborate further then, if I understand this correctly, the signal beneath it in my photo will illuminate and show 'on' if the (what I would call) starter signal it relates to is showing a red aspect. In my photo it shows 'off' so the starter signal it relates to would either show a yellow or green proceed aspect?
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Deleted
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Post by Deleted on Nov 30, 2021 4:49:28 GMT
Thanks for the replies. To elaborate further then, if I understand this correctly, the signal beneath it in my photo will illuminate and show 'on' if the (what I would call) starter signal it relates to is showing a red aspect. In my photo it shows 'off' so the starter signal it relates to would either show a yellow or green proceed aspect? Correct |
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Post by philthetube on Nov 30, 2021 13:40:57 GMT
I would guess, deu to location, that it is for the guard to observe before closing the doors, no longer needed of course.
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Deleted
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Post by Deleted on Nov 30, 2021 14:59:36 GMT
I would of thought so
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Post by ertowerty1 on Dec 9, 2021 8:45:38 GMT
In the days when trains all had guards, the platform repeater was the guards signal that the train was cleared to start and the process of closing the doors and giving the driver the bell could commence.
The signalling North of Harrow on the Hill on the fast lines and North to Amersham was signalled to British Railways standards, hence 4-aspect signalling, lunar white fog repeaters and Banner repeaters.
Fast Passenger and loose coupled goods trains shared these lines and needed substantily longer braking distances than the EP braked underground stock.
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Post by metrailway on Dec 14, 2021 20:02:20 GMT
There are at least a couple of examples still located in Amersham. They look different from the one at Ricky being a square block and hung from the canopy.
The 'ON' and 'OFF' terminology comes from the very early days of semaphore signalling, probably well over 180 years old now. Back in those days, a signal would be put on (so visible to the driver) if there is danger ahead, and put off (so near invisible to the driver) if the line is clear.
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