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

[jdennis@acslink.net.au (John Dennis)]

>This is another of those things that depend opn wher you first learnt
>signalling. NSW people will swear that their system is best; Vic
>people will swear that theirs is. 
>
>In the overall scheme of things it doesn't matter. The NSW system is
>unlike anything else in Aus, The Vic is similar to SA/WA (& Qld?). I
>cannot see NSW agreeing to change the Sydney system signalling just so
>it would be the same as the Glen Waverley line ;-). I think we are
>stuck with, at least, two systems. Maybe we can hope for some
>standardisation especially between Vic and SA. Just agreeing on how
>fast medium speed is would be a start.

Not all of SA now uses speed signalling.  The suburbs have been
re-signalled to use route signalling, similar to British practice,
AFAIK.    I can well remember the old UQ 3-pos semaphore signals
around Adelaide, with three arms.  In Vic the 3-pos semaphores only
ever had two arms, with low-speed indications provided by a light.  

Nothing to do with crossing loops though - although the South line
certainly had UQ signalled loop(s) even in CTC days.

Cheers...JD
==========================================================
John Dennis                         jdennis@acslink.net.au
Melbourne                                  denjo02@cai.com
Australia                   Home of the Dutton Bay Tramway
DBT URL:       http://www.acslink.net.au/~jdennis/dbt.html