Signalling in Victoria

[cmgord@ecr.mu.oz.au (Christopher_Martin GORDON)]

Could someone help with signalling please.
The signalling on the Racecourse Line (melb) is Automatic 2 
position signalling, am I correct in saying is the signal is Green
the it is proceed, Red is Stop.  With a 'A' plate on the signal it
is an auto and can be passed at stop (etc..) Without the 'A' it is
a Home signal? Where there is two signals one next to the other
they give proceed to either the left line or the right.

Other two position signalling, what is the first signal from auto
block signalling called? Home? then you get to the first station and
the usual distant, home, (station), starting.  Now the distant will
only change from yellow to green when;
a) the home signal is set to proceed
b) the starting signal is set to proceed.
Is there any locking of the starting signal (ie with trains in the 
section)?

What is the last signal from two position signalling to auto block 
signalling? repeating?  What are the indications, i think
yellow over yellow,  next signal at stop.
green over yellow, next signal at proceed
and the light are swaped over to show medium speed? is there any
where now that shows medium speed on a repeating signal?

Calling on signals are just like low speed caution? ie line may not be
clear.

Disc signals and dwalf signals? Do disc signals show red and green, and
are they indicating the track is clear or not? and dwalf show red and
yellow, or red yellow or green.  Yellow is line may not be clear, green
is line clear.  Are they any dwalf signals that show green in use in
Melbourne?

One last thing, the centre line on the Box Hill line is Track control
and the city loop and centre line on the Frankston line are auto block
signalling why the difference? what is the difference?




--
Chris Gordon
http://www.ecr.mu.oz.au/~cmgord