Re: [General] Information about block working

["f.u.i.t.b.e.t" <fuitbet@yahoo.com.au>]

Ok,
well what about coota nth to sth,,junee nth to sth,harden nth to sth,none of
these locations have track circuits other than for the starter!
So what type of working is this, double line track block  or just plain
block as trains are accepted and communicated by the block bell and as you
have previously and correctly stated not by a block instrument.
I suppose just another situation left behind with the general appendix
the safeworking units have left so much out and are full of ambiguity.
The general appendix were at times over prescriptive but at the end of the
day they provided for nearly every circumstance and at every interlocking
intermediate sdg etc
"Eddie Oliver" <eoliver@efs.mq.edu.au> wrote in message
3A701627.1916DC63@efs.mq.edu.au">news:3A701627.1916DC63@efs.mq.edu.au...
> "f.u.i.t.b.e.t" wrote:
> >
> > The type of block working you are referring to occurs at many places
what
> > about Cootamundra nth to Cootamundra West. You come off Double line
track
> > block and automatic and on to Double line block which is different to
block
> > telegraph tyers single or three wired.With double lined block each box
has
> > an accepting lever and it does exactly that it accepts the request for
> > signal clearance so unless the bloke at coota west pulls off the
accepting
> > lever the bloke at Coota nth cannot clear the signal to go around the
corner
> > to Coota west and the same occurs on the up.
>
> No, that is NOT the type of block working we are talking about. You are
> seeking to distinguish between Double Line Automatic (DLA) and Double
> Line Track Block (DLTB), and the terminology is further confused by the
> unfortunate generic use of "Track Block and Automatic" (TBA) which no
> doubt has caused much confusion over the years. All of these involve
> track circuits and accepting signals. However this discussion was about
> neither of these systems, but rather block telegraph working (whether
> with Tyers or standard block instruments) without either track circuits
> (except within interlockings) nor accepting levers.