Re: home signal

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

Maurie Daly wrote:

> 
> A signal which can be passed at stop without any form of external authority is
> not a home signal,so therefore all signals which dont meet this criterion are
> home signals.
> I reckon this gets most of them.

No, especially not in NSW. For instance Accept signals require authority
to be passed at stop (except in specified circumstances) but are not
Home signals.

The difference you are describing is (in NSW terms) principally a
difference between automatic and controlled signals; and in some other
systems, it is a difference between permissive and absolute signals.
Home signals are a subset of controlled signals (NSW terminology) and
absolute signals (in those other cases).

Your argument is one of the classical logical conflicts, anyway. No dogs
are cats, but that does not enable you to define cats as non-dogs.

Eddie