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VL19 overlap doesn't time out

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VL19 overlap doesn't time out 30/08/2021 at 11:26 #141422
trolleybus
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ARS sometimes tries to hold trains at VL19 to give priority to a train arriving from Walthamstow. However the points beyond VL19 remain locked, even if you manually cancel VL22B. The result is that nothing moves until you manually set the route from VL19, allowing the 'wrong' train into SS P5 first.
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VL19 overlap doesn't time out 04/09/2021 at 23:32 #141440
madaboutrains
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trolleybus in post 141422 said:
ARS sometimes tries to hold trains at VL19 to give priority to a train arriving from Walthamstow. However the points beyond VL19 remain locked, even if you manually cancel VL22B. The result is that nothing moves until you manually set the route from VL19, allowing the 'wrong' train into SS P5 first.
VL19 I suspect was designed to work as a draw up and its not designed to have a train held at it to allow a train from Walthamstow due to the proximity of it to the junction.

VL22 in reality you'd be holding a train at the 'A' signal as the 'B' works in unison with the 'A' as the button at Coburg was just for VL22 for routes to VL19 (VL22(1)) or P4 (VL22(2))

This sim below is very accurate and simulates how the control from Coburg Street used to work:
https://vicsim.sweetp.net/SVGtest5/vicsim.html?path=none&file=VLFRAME&channel=VicState

RIP Feltham Panel 1
Last edited: 04/09/2021 at 23:37 by madaboutrains
Reason: None given

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The following user said thank you: TUT
VL19 overlap doesn't time out 05/09/2021 at 01:27 #141441
TUT
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I agree with madaboutrains, although I'm not sure draw-up is quite the right word.

I very much suspect that VL22 lever would not be able to be normalised with a train standing at VL19 signal and that will hold the mechanical locking on VL17 points lever, which is very much in keeping with what I've seen of LU signalling generally. The sim (thanks for the link there madaboutrains, I've been looking for that, has it only recently come back up?) seems to corroborate this, although the real nuts and bolts of the system are a bit above my pay grade. I think TG delta track circuit releases VL22 lever to move normal but I could be wrong.

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