Re: Signaller causes SPAD

[signal_spotter@my-deja.com]

And further to my previous post, in the UK you even have another level
of locking on the points, called 'Time of Operation Locking'. This is
added into facing points in the overlap to lock them and stop the
signaller from moving them if the train is almost upon them. From
memory, I think it's to hold them if you SPAD. Normally facing points
aren't locked by a route unless an opposing route is set or a set of
conflicting trailing points are reverse. Time of Operation locking is
only used in the UK to my knowledge. It's certainly not used in NSW.
And I don't think QR have implemented it even though their system is
95% similar to UK.

regards Ian
Signal Design Engineer

In article <8q8tdk$s20$1@nnrp1.deja.com>,
  antstig@my-deja.com wrote:
> In article <8q8iht$esk$1@nnrp1.deja.com>,
>   signal_spotter@my-deja.com wrote:
> >
> > > Then comes the scary bit. The Signaller instructs the driver to
> > proceed
> > > over points even though they have not being scotched and clipped
(we
> > > are not talking about remote securing points here). Even scarier
is
> > > that many drivers obey this instruction.
> >
> > The points would be held by 1)APPROACH LOCKING, 2)ROUTE LOCKING and
3)
> > TRACK LOCKING. Scotched and clipped (or clipped and locked in NSW)
is
> > just a 'belt and braces' safeworking requirement. The safety of the
> > system would not have been compromised by the signaller instructing
> you
> > to proceed.
>
> That's an interesting point which no doubt my signal engineer friends
> will confirm. However I don't know of any driver being disciplined for
> insisting on points being scotched and clipped.
>
> Also a green signal confirms that the points are locked whereas if a
> signaller throws a stick back the signal could fail (rare admittedly)
> at the same time as the signaller threw back the stick.
>
> We say scotch and clip because you put in the scotch first in case the
> points accidentally throw.
>
> Regards
>
> Frank
> > regards Ian
> > Signal Design Engineer
> >
> > Sent via Deja.com http://www.deja.com/
> > Before you buy.
> >
>
> Sent via Deja.com http://www.deja.com/
> Before you buy.
>


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