Re: Setting of Points

[David Johnson <trainman@ozemail.com.au>]

Bernard Smith wrote:

> <signal_spotter@my-deja.com> wrote in message
> 8qp1vg$6cm$1@nnrp1.deja.com">news:8qp1vg$6cm$1@nnrp1.deja.com...
> > In article <ikHz5.58120$c5.160289@newsfeeds.bigpond.com>,
> >   "Bernard Smith" <epping.smiths@gatewaynet.bigpond.com> wrote:
> > > I have a question about the setting of points.
> > >
> > > <snip>
> > >
> > > Looks something like this.
> > >
> > >                       ----------------                      Down
> > > --------------<                          >[a]----------->>>
> > >                      >------------[b]<
> > > <<<---------<                         >[c]-----------------
> > >  Up                ----------------
> > >
> > > <snip>>
> > >
> > >
> > Well Bernard, I designed the signalling interlocking at Gordon (and
> > Lindfield and the auto sections from Nth Syd to Waitara) when I was
> > with State Rail so hopefully I can answer your query. With facing
> > points, they are not normally set normal unless there is a conflicting
> > move set or a track occupied in the overlap or no valid overlap
> > available through the points reverse or there is a set of trailing
> > points locked reverse in the facing points reverse overlap. So even
> > though the overlap was set to the Up main, if the route was set it
> > would have set those points normal (and locked them). As a last line of
> > defence the track circuits would have held the aspect to red as well.
>
> I guess my question boils down to something like "If you are going to have
> conflicting settings, wouldn't it be better to have the trains heading in
> the
> same direction."
>
> With a train in the middle road, this is true at the City end, but not the
> Pymble end (albeit no movement is expected there).  What happens if
> a train comes to a rest and then continues northbound?!?

It hits the trip at low speed and pulls up clear of the opposing movement.

--
David Johnson
trainman@ozemail.com.au
http://www.ozemail.com.au/~trainman/
------------------------------------
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