Re: Today (Sat) on 22 plat. Central

[signal_spotter@my-deja.com]

In article <39db0e51$0$12434$7f31c96c@news01.syd.optusnet.com.au>,
  "Tezza" <tezza2000@dingoblue.net.au> wrote:
> "Chris Downs" <
> > Tezza <tezza2000@dingoblue.net.au> wrote in message
> > > <signal_spotter@my-deja.com> wrote in message news:8rdon6
> > > > PS. The reason we put Intermediate Trainstops in is so you
drivers
> > > > don't become the meat in a metal sandwich. So don't try and
beat the
> > > > system 'cause it's your life.
> > >
> > >
> > > In most places I've seen them, I'd consider them totally
unnecessary.
>
> > Any chance of some specifics (where and why) or was it another
throw away
> > line?
>
> Throw away lines? Moi?
>
> The one in question on 22. The rest at Central. Bondi Junction. I'm
sure other people would say differently, but I just don't think
> they're necessary.
>
>
What do you mean you don't think they are necessary? Do you know the
reason why we put them in. If you did then you wouldn't come out with a
statement like that. They are put in where there is a reduced overlap
(100m) (ie a train sitting on the tracks at least 100m past the signal
therefore the signal in rear would normally be at red). So to increase
headway (ie allow following trains to close up) we need to prove that
you are doing a speed slow enough to warrant reducing the overlap to
100m and allowing the signal to clear. And that's about 20kmh or so. So
if you did trip the speed would be slow enough that you won't run up
the back of the train ahead. Now we can't rely on you saying "OK I'll
only do 20kph" and leave it at that. We have to prove that you do. And
the fact that you have been tripped before indicates that we are
correct in putting them in and not relying on your word or judgement.
Anyway if we were to take them out then you'd be held back at the
signal in rear. They are there for your safety, not mine.

regards Ian
Signal Design Engineer


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