Re: Signalling in Victoria

[markbau1@aol.comQQQQyuk (MarkBau1)]

<<<<<<< The numbers on
the signal posts are usually the lever number, and where there are many levers 
the first lever number is on the post.>>>>>>>

There was never any correlation in 2 pos areas between post numbers and lever
numbers. Posts at a typical installation were numbered 1 on from the down
distant, however there were more levers than posts because of points, locking
bars etc. 

<<<<<<Disc and dawf signals. Most sidings and wrong line moves have/had disc 
signals, if you have a colour light signal is it called a disc, or a two 
position dawf?>>>>>>>>

You can't really have a light dwarf signal although some will argue otherwise.
If its a light signal its a dwarf.

<<<<<<Now three position signalling.  Where you have a signal that shows
red/red, 
yellow/red & green/red it is three aspect signalling?>>>>>

All VR signalling is 2 or 3 "POSITION" signalling. 3 position signals can show
anywhere between 1 and 7 "aspects" Regardless of how many aspects a signal can
display it is still called a 3 position signal

<<<<<Signals the clear in the following order: red/red, red/yellow, yellow/red,

yellow/green, & green/red (I think that is right) it has the yellow/red aspect 
because a full overlap is provided after the train has past some point, but 
the next signal is still red/red.>>>>>>

Overlaps can become a complicate issue. They depend on many things such as
"does the line carry sparks only or sparks and loco hauled" they depend on
track speed and sometimes geographic considerations. There is simply no way one
you can generalise about them. A "full overlap" would be an overlap that
extended all the way to the next signal. For a signal to go from R/R to Y/R
there is only ione thing for sure, the train ahead would have to be passed the
next signal, then, depending on the distance of the overlap the train ahead may
have to be a long way passed the next signal.

<<<<<
All dawf signals are three position (in three position signalling area) but 
some only show two aspects.  The signals at either end of the centre road of 
Clifton Hill are three aspect with trip levers.  Are these dawfs, or home 
signals, or something else?>>>>>>

When Clifton Hill was being resignalled I argued long and hard for the signals
in the centre track to be homes but the powers that be said there was not
enough room for home signals so they installed dwarfs. (There was enough room
for a Flinders St type mini home) The main succes I had was getting the dwarf
to show green, the signal engineers only wanted them to show yellow or red. So
they are dwarfs and it is very unusual to equip a dwarf with a train stop.

<<<<<<<Or like St Albans where you have a home signal, repeating, then a three 
position home.  I think the repeating signal is like a distant (but with a 
yellow marker).  Is that right?>>>>>>

Thats a pretty accurate description of a repeater yes.

<<<<<<<<<What colour are the arms on a semaphore repeating signal?  I know of
only one 
semaphore repeating that was at Maldon Junction any I have no idea what colour 
the arms were.  The top arm was fixed at yellow, and the bottom yellow or 
green.>>>>>>>>

I think there were about 8 semaphore repeaters over the years. IIRC the Rules
and Regs never stated a color for the arms but the one at Maldon, and
presumeably all the others had yellow arms.

Mark.


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