SimSig :: Topic: Western Chain Melksham Route (1/2)

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TOPIC: Western Chain Melksham Route

Western Chain Melksham Route 18 Apr 2012 13:06 #1

njimiller
OFFLINE
Crossing keeper
Posts: 39
Thank you received: 5

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 Apr 2012 14:38 #2

Steamer OFFLINE Local Operations Manager Posts: 545 Thank you received: 155	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.
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Re: Western Chain Melksham Route 18 Apr 2012 14:41 #3

njimiller OFFLINE Crossing keeper Posts: 39 Thank you received: 5	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 Apr 2012 16:00 #4

headshot119 OFFLINE Local Operations Manager Posts: 943 Thank you received: 237	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.
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Re: Western Chain Melksham Route 18 Apr 2012 17:01 #5

Peter Bennet OFFLINE Administrator Posts: 2526 Thank you received: 334	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
	"The fruitcakes were right. I am for the fruitcakes. I am proud to be a fruitcake. Long may fruitcakes continue." Last Edit: 18 Apr 2012 17:01 by Peter Bennet. The administrator has disabled public write access.

Re: Western Chain Melksham Route 18 Apr 2012 18:57 #6

njimiller
OFFLINE
Crossing keeper
Posts: 39
Thank you received: 5

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 Apr 2012 19:49 #7

mfcooper OFFLINE Moderator Signaller, Victoria Central Posts: 437 Thank you received: 74	njimiller wrote: 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 Apr 2012 20:13 #8

broodje
OFFLINE
Trainee signaller
Posts: 83
Thank you received: 5

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 Apr 2012 20:58 #9

Peter Bennet OFFLINE Administrator Posts: 2526 Thank you received: 334	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
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Re: Western Chain Melksham Route 19 Apr 2012 05:29 #10

Hpotter OFFLINE Administrator Posts: 81 Thank you received: 19	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.
	Howard. Last Edit: 19 Apr 2012 05:30 by Hpotter. Reason: Not being awake enough! The administrator has disabled public write access.