Re: [Melb] Broadmeadows re-signalling

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

Christopher_Martin GORDON <cmgord@ecr.mu.oz.au> wrote in message
7ttprk$c3h$1@mulga.cs.mu.OZ.AU">news:7ttprk$c3h$1@mulga.cs.mu.OZ.AU...
> : For whatever reason, the Starting Signal into a DLB section is always
> : a Two position signal.
>
> : Somerton is an island of 3 Position Signalling, but the Starting
> : Signal is again 2P.  (And the Home off the Upfield Line, for that
> : matter).
>
> Somerton is a very wierd place, and that home from the Upfield line is
> fixed and the calling-on is used for that movement.
<snip>

Chris,

The reason for Somertons mixture of 2 and 3 position signalling would be the
result of the Standard Gauge being opened in 1962, whilst the station layout
is fundermentally a 2 position area, the fact that it has access to cross
the SG Mainline would have necessitated the use of 3 position signals, note
that only those BG signals that protect the grade crossing are 3 position.

The fixing of the Home ex Upfield would be the result of a lack of track
circiuting, the Calling On indicating that the track section maybe occuppied
up to the next Dwarf, the home (even fixed) would be purely cosmetic as it
was (still is)? an Arrival signal on a mainline therefore nothing short of a
Home would have been acceptable to a (once) rather conservative VR.

Bob.