Re: [NSW] Tangara Derailment , Hornsby

[signal_spotter@my-deja.com]

In article <y4Wd5.40881$N4.1548908@ozemail.com.au>,
  "Chris Downs" <cvdowns@ozemail.com.au> wrote:
> I have no track or signal diagrams.
>
> For the points immediately north of Hornsby on the down Shore
(platform 3) I
> thought each blade on the points was controlled separately.
Therefore to
> act as catch points both point blades held towards the centre putting
a
> passing train into the dirt.  The down departure signal on platform 3
is
> located just short of the end of the platform and the points in
question are
> virtually on top of the signal.
>
> I assume (time to make an ASS of U and ME) that this is what happened.
>
> Right or wrong?
>
> Chris
>
So did the accident happen on Platform 2 or 3. Platform 3 is the up
main as pointed out. The points just north of that are not
independantly controlled, they're called 'slips'. In other words it's 2
sets of points in the one. And they're controlled by levers 521 and
522. At the north end of platform 3 the points are independantly
controlled by levers 522 (the other end to the slips) and 524. Both of
them can be normal and the train will fall in the dirt. With the slips
there will always be a correct lie of the points so no matter what way
they're lying a train shouldn't derail unless of course they
become 'trailing' behind the train and it backs into them.

regards Ian
Signal Design Engineer and Hornsby expert


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