Re: Three Position Signalling

[Yuri J Sos <steam4me@enternet.com.au>]

On Fri, 8 Oct 1999 10:10:08 GMT, mauried@commslab.gov.au (Maurie Daly)
wrote, and I selectively quote:

>Lets assume that an SG train has left Brooklyn and is heading for Tottenham.
>Signaller in TottyB Box mistakes oncoming SG train for BG train and attempts 
>to clear signal TOT/U8 by causing it to display R/R/Y with a V indication.
>A/ Is the above possible.

An SG train won't leave Brooklyn until it's got somewhere to go beyond
Tottenham.  If there is an SG train on the way, Tottenham "B" loses
control of the junction and cannot set any signals itself, nor can it
set up any conflicting routes (it's effectively switched out).  If
there's an SG train, the only thing the signaller at Totty "B" does is
dispense or receive the electric staff for the Brooklyn - Totty "B"
section.   

>Obviously if the SG train does pass the signal at R/R/Y a prang is quite 
>possible at the SG junction.

No.  Tottenham "B" has no control over the SG signals, only BG -- the
BG is locked out by Centrol/Mile End.

Centrol/ARTC only hand over control of the junction when there's no SG
train around,  so that that danger doesn't arise.

       
Regards

Yuri
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Yuri J Sos
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