Re: Simple Question.....

["Krel" <krel4203@netconnect.com.au>]

The way it was explained to me a long time ago was -
The top light indicates the track section ahead green = clear yellow =
turnout & red = stop (occupied). 
The lower light indicate what you can expect to find on the next signal
green = a proceed indication, yellow = a caution indication & red = a stop
indication.

A driver in the country area would find green over green ( track clear,
next signal proceed) then green over red ( track clear, next signal at
stop) then red over red (stop).

In the metro areas after the green over green the driver may find a green
over yellow (track clear, next signal at caution); this is to give more
braking distance when signals are closer together.

"When upper yellow functions look out for turnout junctions, when the
yellow's down below watch your speed - medium slow."


-- 
Cheers Krel

The Law of Inverse Proportions - The chances of the signal clearing 
without having to get out of the cab and go to a lineside phone is inversly
proportional to the amount of rain falling at the time :-)
David Proctor <daproc@bigfoot.com> wrote in article
<01bd1690$aefa8fc0$0a4a23cb@locxvcym>...
> 
> 
> tezza <tezza@atinet.com.au> wrote in article
> <68dr4h$cc3$1@loomi.telstra.net>...
> > 
> > David Proctor wrote in message <01bd15bb$406b8da0$0e4a23cb@locxvcym>...
> > >Simple really - although complicated if you do not know (I presume you
> are
> > >talking about NSW safeworking here)
> > >
> > >The top light is the authority to enter the next section - Red = stop,
> > >Yellow = turnout, Green = go
> > 
> > *Yellow does not always mean turnout, it may mean that there is a
signal
> at
> > stop within breaking distance.
> 
> Not on the top light of a two aspect signal - yellow ALWAYS means the
train
> is taking the turnout. 
> 
> > 
> > >The bottom light gives an indication of the signals in advance.
> > >Thus, 2 Reds indicates stop, this will be preceded by a Green over
Red,
> > 
> > *or yellow over red
> > 
> > >which will be preceded by a Green over Yellow,
> > 
> > *or 2 yellows or 2 greens
> > 
> > > which will be preceded by a
> > >Green over Green - thus, a driver will get at least two signals
advance
> > >warning of a signal being at stop.
> > 
> > *Incorrect, a Driver may only get one signal's warning in advance of a
> > signal
> > being at stop. i.e. 2 greens, green over red, 2 reds.
> > 
> > >There are variations on this, with some other peculiarities thrown in,
> > >(such as Close-Up and low-speed signals) but the principle is
basically
> the
> > >same.
> > >
> > >Hope the above is of assistance.
> > >David Proctor
> > >daproc@bigfoot.com
> > >
> > >David Bradshaw <dab@sydney.dialix.com.au> wrote in article
> > ><883539593.340513@fermi.dialix.com.au>...
> > >> Just a simple question from an inquisitive commuter:
> > >>
> > >> Often I see two sets of lights one atop the other (ie on the same
> post).
> > >> I gather (correct me if I'm wrong here) that red = stop;
amber=proceed
> > >> with caution; green = proceed, though I am a bit lost as to the role
> of
> > >> the dual signals!!
> > >>
> > >> David Bradshaw
> > >>
> > >>
> > 
> > 
> > 
> > 
> > 
> > 
> > 
>