Re: Crossing loop design (r.e. Southern Aurora crash)

[mauried@commslab.gov.au (Maurie Daly)]

In article <36c520dc.0@news.bris.corplink.com.au> "MattyQ" <matticue@corplink.com.au> writes:
>From: "MattyQ" <matticue@corplink.com.au>
>Subject: Re: Crossing loop design (r.e. Southern Aurora crash)
>Date: Sat, 13 Feb 1999 16:59:44 +1000


>>Not all of SA now uses speed signalling.  The suburbs have been
>>re-signalled to use route signalling, similar to British practice,


>Yes, but in a rather obscure move, they kept the American speed signalling
>terminology and rules and applied it to British route signalling. The result
>has seen some strange practises as a result (eg: feathers on signals
>protecting TRAILING points).  See the "Australian Signalling" post for more
>details.Regards

>Matt Smith
>Brisbane, Queensland
>matticue@corplink.com.au

>You can't slam a revolving door.


One anomaly which Ive noticed in SA on the CTC between the Vic border and 
Keswick , is that unlike the Vic arrangement, the departure signals from the 
No 2 road of the crossing loops have a pair of color spots exactly the same as 
the home arrival signals (ie both have movable lenses.) , yet Ive never seen 
the upper aspect show anything but red ,ie the aspects seem to be R/R , R/Y or 
R/G .
Also unlike Vic CTC there is also another 3 spot home signal about 2 kms 
after a crossing loop.
Anyone know the permissable aspects for the SA system.

MD