Re: Simple Question.....

["David Proctor" <daproc@bigfoot.com>]

Bill Bolton <billbolton@REMOVE-TO-EMAILacslink.net.au> wrote in article
<34aacd1f.674355@news.bigpond.com>...
> "David Proctor" <daproc@bigfoot.com> wrote:
> 
> > which will be preceded by a Green over Yellow,  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.
> 
> There are many signals in the Sydney suburban area with no yellow
> light on the bottom head, so a driver may only get a one signal
> advance warning of a double red.  The provision of a yellow light on
> the bottom head (when no turnouts are involved) appears to be related
> to traffic density and block length.

Hence the reason why I stated that there are variations on this.The North
Shore is like this, but due to the curves and gradients, trains are
generally travelling at such a speed that the driver does not need two
signals warning of a stop signal.

> 
> Cheers,
> 
> Bill
> 
> Bill Bolton
> Sydney, Australia
> 

-- 
Regards

David Proctor
daproc@bigfoot.com