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WK126 Alternating Between Danger and Caution

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WK126 Alternating Between Danger and Caution 26/01/2023 at 19:11 #150275
Gwasanaethau
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509 posts
Hi all,

Here is a strange one. I have set WK126 (Up Slow at Surbiton) towards W232 (Up Fast) immediately behind the passage of 1P38 on the Up Fast. The route was set with 1A38 still passing over Hampton Court Junction, so the flashing aspects were automatically selected. WK126 is now alternating between red and yellow (danger and caution) in time with the flashing of WK128. WK128 is illuminated yellow when WK126 is red, and is not illuminated when WK126 is yellow. Looks freaky! XD

Save is attached.

Mark (Gwasanaethau).

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Last edited: 26/01/2023 at 19:12 by Gwasanaethau
Reason: Spelling corrections.

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WK126 Alternating Between Danger and Caution 28/01/2023 at 23:23 #150302
clive
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2789 posts
The only thing odd I can find is that when 126 is red 128 is showing single yellow while when 126 is yellow 128 is showing flashing single yellow. Nothing else I can see is changing between the two states and I can't see anything unusual in the sim data that could cause this.

(Peterborough has an odd situation where a failure at one signal can cause another to alternate between red and yellow until the approaching train has reached a certain track circuit. It's explained somewhere in the forum and we believe it's prototypical. However, there's special data to make that happen.)

I can only guess it's something to do with the flashing detection, but I'd have to dig into the code.

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WK126 Alternating Between Danger and Caution 28/01/2023 at 23:46 #150303
Dionysusnu
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Might this be the same issue as https://www.SimSig.co.uk/Forum/ThreadView/53268 ?
Last edited: 28/01/2023 at 23:46 by Dionysusnu
Reason: None given

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WK126 Alternating Between Danger and Caution 29/01/2023 at 03:24 #150307
Gwasanaethau
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Dionysusnu in post 150303 said:
Might this be the same issue as https://www.SimSig.co.uk/Forum/ThreadView/53268 ?
Hiya, thanks for looking into it.

On the surface it certainly looks identical, but I couldn't tell you if it has the same underlying cause.

Mark (Gwasanaethau).

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WK126 Alternating Between Danger and Caution 30/01/2023 at 13:25 #150319
clive
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2789 posts
Mantis 37855 on the core code.
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