Why no ACOA at signal 37?

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Why no ACOA at signal 37? 14/06/2013 at 13:00 #45694
maxand
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1637 posts 		Wembley Sub v2.216, default TT



S212 is stopped at Stonebridge Park at signal 35, waiting for a route to be set to the LU depot. 2D86 has stopped at 37. Thinking to expedite matters I set a route for 2D86 from 37 to 35, not realizing that the overlap extends way past 35 (arrowed), thus making it impossible to set S212's route to the depot, which requires the points ahead of it to be set to reverse.

Resigning myself to another ACOA and 2-minute delay, I cancelled the route at 37, but surprisingly cancellation took place immediately and no ACOA occurred. I can now set S212's route to the depot.




Why was there no ACOA from 2D86?
Last edited: 14/06/2013 at 13:04 by maxand
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Why no ACOA at signal 37? 14/06/2013 at 13:08 #45695
Zoe
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258 posts 		" said:
Why was there no ACOA from 2D86?

The aspect of signal 37 remained at danger when you set the route and so did not change when you cancelled it.
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Why no ACOA at signal 37? 14/06/2013 at 13:09 #45696
Zoe
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258 posts 		" said:
Why was there no ACOA from 2D86?

The aspect of signal 37 remained at danger when you set the route and so did not change when it was cancelled.
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Why no ACOA at signal 37? 14/06/2013 at 13:10 #45697
Zoe
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258 posts 		" said:
Why was there no ACOA from 2D86?

The aspect of signal 37 remained at danger when you set the route and so there was no change of aspect when you cancelled the route.
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Why no ACOA at signal 37? 14/06/2013 at 13:12 #45698
Zoe
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258 posts 		" said:
Why was there no ACOA from 2D86?

The aspect of signal 37 remained at danger when you set the route and so did not change.
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Why no ACOA at signal 37? 14/06/2013 at 13:12 #45699
Zoe
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258 posts 		" said:
Why was there no ACOA from 2D86?

The aspect of signal 37 remained at danger when you set the route and so there was no change of aspect when you cancelled it.
Last edited: 14/06/2013 at 13:13 by Zoe
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Why no ACOA at signal 37? 14/06/2013 at 13:13 #45700
dwelham313
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139 posts 		Because the signal didnt clear in the first place! The driver of 2D86 is just staring at a red signal, not knowing what you're doing ahead. An 'Adverse Change Of Aspect' only occurs when the aspect changes to a more restictive aspect which in this case, it did not.
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Why no ACOA at signal 37? 14/06/2013 at 13:14 #45701
Steamer
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3997 posts 		Because there's no Adverse Change of Aspect! Signal 37 had not cleared and therefore the route can be cancelled immediately, with no time out and no aspect change.

EDIT: Wow, three replies at once!
"Don't stress/ relax/ let life roll off your backs./ Except for death and paying taxes/ everything in life.../ is only for now." (Avenue Q)
Last edited: 14/06/2013 at 13:14 by Steamer
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Why no ACOA at signal 37? 14/06/2013 at 13:23 #45702
maxand
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1637 posts 		Thank you all for responding so quickly. Of course!
Last edited: 14/06/2013 at 13:24 by maxand
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Why no ACOA at signal 37? 14/06/2013 at 13:24 #45703
Aurora
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183 posts 		Why would there be an ACOA?

The signal can't even clear to allow 2D86 to move forward. There's no subsidiary signal with Signal 37. Thus it can't clear until 2S12 departs Stonebridge Park and clears that section of track-circuited track plus the overlap past Signal 35.

Have I missed something here?
Nil.
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Why no ACOA at signal 37? 14/06/2013 at 13:27 #45704
Danny252
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1461 posts 		" said:
Because there's no Adverse Change of Aspect! Signal 37 had not cleared and therefore the route can be cancelled immediately, with no time out and no aspect change.

EDIT: Wow, three replies at once!
And a fourth after the OP responded - is that a record?
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Why no ACOA at signal 37? 14/06/2013 at 14:08 #45705
lazzer
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636 posts 		I might be wrong, but is it because no change of aspect occurred? :dry:
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Why no ACOA at signal 37? 14/06/2013 at 16:12 #45706
Danny252
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1461 posts 		" said:
I might be wrong, but is it because no change of aspect occurred? :dry:
Five! Anyone want to take bets on how many more people will answer this?
Last edited: 14/06/2013 at 16:12 by Danny252
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Why no ACOA at signal 37? 14/06/2013 at 16:56 #45709
Backup
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89 posts 		I blame Scary Pigeon.
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Why no ACOA at signal 37? 15/06/2013 at 15:16 #45722
georgerb
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36 posts 		Sorry I am late, but the answers supplied are all correct.
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