Re: Three Position Signalling

["Exnarc" <gwrly@netspace.net.au>]

When I learnt signals I was always told, that 3 position dwarfs can show a
Red/Purple -Yellow and Green light whilst 2 position Dwarfs only show
Red/Purple or Green lights. So that is one fundamental way of determining
what type of Dwarf you are looking at, (If you know your roads and signals
you should already be aware of what type you are looking at anyway).

But now of cause 2 position Dwarfs can show a Yellow light, Its one of the
questions in the Computer Based Signals Exam infact.
(Albeit a trick question).

There are (at least) 3 locations where 2 Position Dwarfs show a Yellow
Light.

1: Portland.

2: Showgrounds. From Platform to Up Refuge Siding.

3 Newport. Dual Gauge to Anzac Siding.

They are mounted on the same post as a Home Signal and only light up when
the signal is pulled off. Unlike a Calling On signal they do not read to the
same road as the Home signal, but other than that they look the same,
except, they have the word "Siding" painted on or attached to the target..

The purpose of these signals resulted from the need to find a replacement
for the mechanical Disc signal, so the Siding Dwarf was developed.

So there you are: A 2 Position Dwarf that exhibits a Yellow light.

Refer Page 2-8  Rule 7(b) Section 2

Bob.

Christopher_Martin GORDON <cmgord@ecr.mu.oz.au> wrote in message
news:7t1l1j$406$2@mulga.cs.mu.OZ.AU...
>
> : > Are there any mechanical three position dwarfs left? (Ie wire pull
ones)
> : > or was the ones at Ringwood the last.
>
> : Wasn't the wire operated dwarf at Ringwood 2 position? (Centre road for
up
> : movements).
> : There was one on the back road as well... (signal 30 I believe)
>
> There were three at Ringwood, 28 up move out of no.2A (centre road), 30
> up move from no.1 (back road) to either siding 'e' or the up line, and
> 21 set back from up line to either No.3, No.2A, No.2 or No.1.
>
> All three were operated by wire from the signal box.  They had red and
> yellow lenses and worked in the upper quandrant.  So that would make them
> a three position signal (since a two position dwarf works in the lower
> quandrant and has red and green lenses, see post 7 at Showgrounds Refuge
> Siding)
>
>
>
>
> --
>
> Chris Gordon
> http://www.ecr.mu.oz.au/~cmgord
>
> +++++++++++++++++++++++++++++++++++++++++++++
> e-mail: cmgord@ecr.mu.oz.au
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