Re: Signalling Questions in Brisbane?

[Eddie Oliver <eoliver@efs.mq.edu.au>]

signal_spotter@my-deja.com wrote:

> >
> I disagree. The order of aspects in QR (and UK which QR signalling is
> 99% based upon) from most restrictive to least restrictive is:- Red,
> Yellow, Flashing Yellow, Double Yellow, Flashing Double Yellow and
> Green. This is how the aspect codes are written in SSI for the signal
> memory.

Well, if you write your SSI codes like that in Brisbane, you might just
have a few problems. The use of flashing yellow in Brisbane is NOTHING
like the use in Britain - on QR it is more or less the equivalent of a
NSW low speed for restricted overlap conditions (except that the
permitted speed is faster), whereas in the UK it is an indication of an
approach-cleared junction signal ahead. And QR has no use for flashing
double yellows, which in the UK situation are an advance warning of a
flashing single yellow; presumably all QR flashing yellows are preceded
by a steady single yellow.

Eddie