Re: [General] Signal failures

[signal_spotter@my-deja.com]

In article <399BD897.5A599309@ozemail.com.au>,
  trainman@ozemail.com.au wrote:
> Ronald BESDANSKY wrote:
>
> > What I am suggesting is that the most appropriate thing to do in
this
> > situation is to introduce telephone (or radio) absolute block
working, which
> > would surely be preferable to each and every train having to
proceed at
> > "extreme caution" through the affected section(s). Of course, this
assumes
> > there are suitably qualified staff at the locations concerned.
>
> You seem to be forgetting why the signal failed in the first place.
What if
> there is a broken rail?  If you introduce "block working" and
authorise the
> trains to proceed at a speed other than extreme caution, you could
then cause a
> major derailment.
>
> --
> David Johnson
> trainman@ozemail.com.au
> http://www.ozemail.com.au/~trainman/
> ------------------------------------
> These comments are made in a private
> capacity and do not represent the
> official view of State Rail.
> C.O.W.S. Page 11.
>
>
I agree. The only reason an auto signal has not cleared is a) track
circuit de-energised, or b) trainstop failed to return to normal. Now
with a) the reason a track circuit has de-energised is because there is
a train on it or it's open circuited ie broken rail, blown fuse etc.
You're asking the driver to determine which it is. If I was a driver,
I'd be thinking that there is a train just around this corner.

regards Ian
Signal Design Engineer


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