Re: home signal

[Eddie Oliver <eoliver@efs.mq.edu.au>]

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. 

Eddie