SimSig :: Topic: My first SPAD (1/2)

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TOPIC: My first SPAD

My first SPAD 24 Jan 2010 13:53 #1

pilotman OFFLINE Signaller Posts: 185 Thank you received: 5	Thought I would report a very rare event. A TC failure at Werrington jnc on the down Ketton caused 2 signals to go to danger. (One controlled and 1 auto). I noticed the first affected train stop and then restart at the auto, so I brought up "show auto aspects" and sure enough it was red. The next train went by in the same way, only stopping at the red controlled signal. Any comments??
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My first SPAD 24 Jan 2010 13:53 #2

pilotman OFFLINE Signaller Posts: 185 Thank you received: 5	Thought I would report a very rare event. A TC failure at Werrington jnc on the down Ketton caused 2 signals to go to danger. (One controlled and 1 auto). I noticed the first affected train stop and then restart at the auto, so I brought up "show auto aspects" and sure enough it was red. The next train went by in the same way, only stopping at the red controlled signal. Any comments??
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My first SPAD 24 Jan 2010 16:35 #3

AndyG NOW ONLINE Moderator Posts: 969 Thank you received: 146	I thought I had that happen at an auto sig at R with TCF near Huntingdon. Wondered whether SImSig now models drivers passing red auto signal on their own authority, as in mplay can't ring clients at present.
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My first SPAD 25 Jan 2010 14:33 #4

pilotman OFFLINE Signaller Posts: 185 Thank you received: 5	That's a good point Andy - I have a vague recollection of seeing this in the forum somewhere?? Of course I am in single user. I haven't done multi for a time, but doesn't the host field all the phone calls from signals? Of course if the driver gets no reply I guess he would be justified in self-authorising. Ray
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My first SPAD 25 Jan 2010 16:15 #5

JamesN OFFLINE Signaller Posts: 131 Thank you received: 13	Phone Calls have gone to the relevant workstation for quite a while now, but host still is the only person who can make calls to shunters (EG Toton on Trent)
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My first SPAD 26 Jan 2010 13:36 #6

clive OFFLINE Administrator Posts: 690 Thank you received: 184	AndyG wrote: Wondered whether SImSig now models drivers passing red auto signal on their own authority No, it does not! Can anyone reliably recreate this situation of trains SPADing? If so, please let me know how so that I can investigate.
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My first SPAD 26 Jan 2010 18:59 #7

pilotman OFFLINE Signaller Posts: 185 Thank you received: 5	Well it will need someone who can set up a TC failure. In this instance the failure affected the overlap of signal 471, which caused signals 471 and 475 to go to danger. Two trains then passed 471 at danger, only reporting a stop at 475. I don't know if this is specific to these signals, or something generic (more likely) Ray
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My first SPAD 26 Jan 2010 23:06 #8

clive
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Posts: 690
Thank you received: 184

Do you mean the overlap of 471, or the overlap of 475, or the track circuit immediately beyond the overlap of 475 (the one that ends at the points)?

If it was the last of these, there's an explanation. When 475 is red for any reason, 471 is approach-released. Unless you were watching closely, you might have missed 471 being yellow for only a few seconds. (Real signalmen miss this as well - read the report into the Farnley Junction collision.)

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My first SPAD 27 Jan 2010 08:00 #9

pilotman OFFLINE Signaller Posts: 185 Thank you received: 5	I think that's a likely explanation - it would explain why trains appeared to creep up to 471 then accelerate past. It's the TC ending at the points which was down. Thanks for the explanation Clive Ray (nee pilotman)
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My first SPAD 27 Jan 2010 08:51 #10

clive OFFLINE Administrator Posts: 690 Thank you received: 184	You're welcome. You'll see this same behaviour on the fast line as well, for the same reason. Andy: do you recall any more details of what you saw? I can't think of any special signalling around Huntingdon, but it would help to at least know which track and roughly where so that I can confirm or deny.
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