TCF on LUL Affecting Wrong Signals?

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TCF on LUL Affecting Wrong Signals? 28/09/2013 at 21:38 #49663
Gwasanaethau
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509 posts 		Hiya,

I am not sure if this is correct, so I thought I would post it here anyway for clarification if nothing else. A track circuit has failed beyond signal A758, but it seems to have reverted signal A756B to red instead. I have attached a screenshot to illustrate.

Regards,

Mark.
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TCF on LUL Affecting Wrong Signals? 29/09/2013 at 08:30 #49668
GW43125
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495 posts 		" said:
Hiya,

I am not sure if this is correct, so I thought I would post it here anyway for clarification if nothing else. A track circuit has failed beyond signal A758, but it seems to have reverted signal A756B to red instead. I have attached a screenshot to illustrate.

Regards,

Mark.
Could you turn 'track circuit breaks' on- might help explain it
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TCF on LUL Affecting Wrong Signals? 29/09/2013 at 18:07 #49673
Harsig
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16 posts 		" said:
Hiya,

I am not sure if this is correct, so I thought I would post it here anyway for clarification if nothing else. A track circuit has failed beyond signal A758, but it seems to have reverted signal A756B to red instead. I have attached a screenshot to illustrate.

Regards,

Mark.
No that isn't right. That track circuit failure should return both signals A756B and A758 to danger. It is probably a tiny error in the signalling data that was missed in testing, something that is very easily done. Some years ago I wrote my own simulation of the signalling in the Harrow area, having been a signalman there in the past, and when I went to check my sim this morning to see how the signalling in the North Harrow area behaved, I discovered that I also had a data error which had been lurking undetected for years, and which produced a result almost identical to the one above. Once corrected I was able to produce the series of screen shots ( Screen Shots Click Here ) from my sim which shows the correct behaviour for all the signals as each of the four track circuits between A758 and A764A is occupied in turn. Note that the diagram in my sim is the other way up to Simsig (ie Marylebone to the left and Aylesbury to the right) as this corresponds to the orientation of the real diagram in Harrow On The Hill signal cabin. Note also that my sim was depicting the signalling as it was in the mid 1960s so some of the signal numbers differ from those shown in Simsig. They are the same signals but were renumbered when when Pinner Goods Yard was taken out of use and all the controlled running signals in the Pinner area were converted to automatic operation. Note that in Simsig the track circuit indications for the four track circuits are combined into two pairs ie occupation of either of the first two track circuits causes the same (combined) section of track to show occupied on the diagram. The attached image shows five screen shots which in sequence ( Screen Shots Click Here )

  • 1 No track circuits occupied

  • 2 Track circuit 756b occupied

  • 3 Track circuit 756c occupied

  • 4 Track circuit 758a occupied

  • 5 Track circuit 758b occupied
Last edited: 29/09/2013 at 18:25 by Harsig
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