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Western Chain Melksham Route

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Western Chain Melksham Route 18/04/2012 at 13:06 #31663
njimiller
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I'm afraid I've had this problem before and I still can't work out why.

I have SwinDid chained to Westbury which is in turn chained to Exeter with the 2011 Tours and Diversions timetable. All seems fine but I've just sent the first train of the day to Swindon via the Melksham route but now the route won't clear to permit anything to come the other way as the route in the up direction appears to be partially set. As a result if I request the slot from SwinDid to Westbury - at the Westbury end I'm told I can't give it because of conflicting route locking.

Any thoughts much appreciated. Nick


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Re: Western Chain Melksham Route 18/04/2012 at 14:38 #31664
Steamer
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Have you set, and then cancelled, a route over the line, or done anything with the Incident Control Panel on the shared track? I think that can 'break' the slot system.
"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)
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Re: Western Chain Melksham Route 18/04/2012 at 14:41 #31665
njimiller
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I didn't do anything like that pre-incident. I've tried setting the route on the up Melksham then cancelling it but it still leaves those sections of track and the up arrow lit white.
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Re: Western Chain Melksham Route 18/04/2012 at 16:00 #31668
headshot119
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You don't request a slot at the Wesbury end, which I believe is what you have done.

If both sims are chained and you do this it locks the route from Chipenham to Bradford junction and there is no way to clear it.

You should only press the slot on Westbury if Swindid have already requested it.

"Passengers for New Lane, should be seated in the rear coach of the train " - Opinions are my own and not those of my employer
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Re: Western Chain Melksham Route 18/04/2012 at 17:01 #31670
Peter Bennet
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I became aware of this fairly recently and have not investigated it yet but someone told me it was a core code issue - I can't say for sure. I do not recall it from testing prior to release though.

Peter

I identify as half man half biscuit - crumbs!
Last edited: 18/04/2012 at 17:01 by Peter Bennet
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Re: Western Chain Melksham Route 18/04/2012 at 18:57 #31671
njimiller
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I have re-run this a number of times varying whether Westbury chains first to SwinDid or vice versa and each time the first train to be sent up Melksham to Swindon (no slot requested from Westbury) leaves the route open to traffic only in that direction and it's impossible to send anything Swindon to Westbury.

I'd be interested to know if anyone else can make this work. Perhaps I am chaining incorrectly or there is a bigger issue as Peter suggests.

Thanks for all the help so far.
Nick

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Re: Western Chain Melksham Route 18/04/2012 at 19:49 #31672
mfcooper
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" said:
I'd be interested to know if anyone else can make this work.
As Peter says, there is an issue, possibly in the core code, so this will not work as it should do. There might be a way to do this by passing signals at danger from one sim to the other as a temporary measure, but I don't know if this would work...

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Re: Western Chain Melksham Route 18/04/2012 at 20:13 #31673
broodje
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Peter, in the old way of chaining* there was an issue with the fact that at Melksham the route changes from up to down. Trains were not always correctly transported over to the next sim due to that. Maybe this bug was not squashed propperly, even though the chaining code got changed? I know we needed quite a few revisions before Westbury, Bristol and Swindid communicated as intended.

*I mean the way it was done 3 years ago or so, in the previous version of westbury

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Re: Western Chain Melksham Route 18/04/2012 at 20:58 #31674
Peter Bennet
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My current thinking is that it's to do with the dispayed TC being a combined TC (of 4 underlying ones) and in this case 1 belongs to Swindon and 3 to Westbury. I think Howard has done a bit more exploration of this.
It's difficult to test at the moment till Geoff gets up and running again as the files are on the server.

The actual crossing of trains seems OK.

Peter

I identify as half man half biscuit - crumbs!
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Re: Western Chain Melksham Route 19/04/2012 at 05:29 #31675
Hpotter
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Peter:

I have indeed done some more testing on this, and have a possible work round atm. Will have to make sure then I shall let you know if it works.

Last edited: 19/04/2012 at 05:30 by Hpotter
Reason: Not being awake enough!

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Re: Western Chain Melksham Route 19/04/2012 at 06:35 #31676
broodje
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I thought the Taunton end also consists of combined track circuits? These never gave any problems. Or am I mistaken about that? It has been a long time since I saw the code of Westbury.
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