Re: home signal

[David Johnson <trainman@ozemail.com.au>]

Eddie Oliver wrote:

> Maurie Daly wrote:
>
> > Uranquinty loop is a short loop, only 900 M long so the possibly of refuging a
> > train between signal 15 and signal 25 , the departure home is very unlikely.
> >
> >       5                                       15         25
> >     -o-o                                   -o-o       -o-o
> > ----------------------------------------------------------------------------
> >              \   o-o-                                     /    o-o-
> >                --------------------------------------------
> >                  o-o-                   -o-o \       -o-o
> >                                             17  \        27
> >                                                    \---------
> >                                                      o-o-
> >
> > I hope the picture comes out ok.
> > Apart from making the diagram look nice , ie the signals are symmetrical
> > I can so no purpose for signal 15.
>
> My recollection (but quite likely wrong) is that it was there for
> consistency. It was thought that drivers may be misled by having the
> Kywong line junction signal (17) unmatched by a corresponding signal on
> the main - i.e. it was best to have every signal on one track associated
> with one on the other, so that except when a train was obstructing view,
> drivers would always see two signals and therefore deduce by a simple
> right-hand/left-hand decision which signal applied to their train.

A bit like the problems encountered by down Bankstown trains leaving Campsie, or
down trains leaving Leightonfield, where all they see is red signals, even though
they do not apply to them.


--
David Johnson
trainman@ozemail.com.au
http://www.ozemail.com.au/~trainman/
------------------------------------
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