Re: Signalling Questions in Brisbane?

["MattyQ" <mattyq1009@dingoblue.net.au>]

This is half of the full explanation. Ian, you've explained what happens
when the signal is green. What about when it isn't? What about the warning
and indications a driver gets in the cab. For an explanation of AWS, go to
http://www.trainweb.org/railwaytechnical/sigtxt1.html#AWS   This is British
AWS but almost identical to QR AWS.


--
Matt Smith
Brisbane Australia.

Reply to mattyq1009@dingoblue.net.au


<signal_spotter@my-deja.com> wrote in message
news:8jea4s$aul$1@nnrp1.deja.com...
> Also what is AWS ?
> >
> Others have pretty well explained the other queries so I'll elaborate
> on AWS. The prime use of the AWS system (in QLD) is to give a warning
> in the cab to a train driver of the aspect of the signal ahead. In the
> UK (where QLD signalling is from anyway) it can also give warnings of
> speed restrictions and SPAD's. Each AWS inductor installation always
> has a permanent magnet and this, when detected by the train borne
> apparatus, triggers a warning to the cab. If the signal to which it
> applies has a green aspect then an electro-magnet is situated beyond
> the permanent magnet in the direction of travel. This is energised,
> when the signal is alight and displaying a green aspect, to an opposite
> magnetic polarity to that provided by the permanent magnet. The
> detection by the train borne apparatus of the permanent magnet followed
> by the energised electro-magnet results in a clear indication, rather
> than a warning, being given in the cab to the driver. It gets more
> complicated for bi-directional lines (or through points etc) where the
> AWS magnet only applies to one direction. In that case the permanent
> magnet is fitted with a suppression coil to counteract its effect and
> that coil is energised by the wrong road signals.
>
> Hope this helps.
>
> regards Ian
> Signal Design Engineer
>
> PS Matty Q, what's wrong with Roma Street??? (I can hear Pandora's Box
> opening now) :-)
>
>
> Sent via Deja.com http://www.deja.com/
> Before you buy.