Re: "lost" trains

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

Notagunzel wrote:

> David Johnson <trainman@ozemail.com.au> wrote in message
> 38621202.B85D5466@ozemail.com.au">news:38621202.B85D5466@ozemail.com.au...
> > Roy the Boy wrote:
>
> > > Sand on the rail had absolutely nothing to do with the accident between
> 3801
> > > and an intercity. A 200 tonne loco does NOT  loose contact with the
> rails.
> > > The findings of the investigation were a white wash. Any admission of
> signal
> > > problems would have opened the SRA to huge legal liabilities.
>
> > You do not know what you are talking about.  Sand has been proven to
> insulate
> > trains from the track circuits, including 110 tonne locomotives.  Yes,
> sand was
> > the reason that 3801 was isolated from the track circuits.
>
> Could someone please explain what sort of track circuit was involved at
> Cowan?

"On the Up track, AC 50 hertz double rail track circuits are installed from
Cowan to 34.6B.  Audio frequency jointless track circuits are installed from
34.6A to Hawkesbury River.

"AC VL shelf type relays are installed from Cowan to 32.9C location.  50V DC
miniature plug-in relays are installed in 34.3, 34.6 and 35.1 locations, with
the exception of 34.6B track relay in location 34.3 which is an AC VT shelf type
relay.

"New signalling cable had been installed from Cowan to 34.3 location in 1988 and
from 34.3 to 35.4 locations in 1989."

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