Re: "lost" trains

["Notagunzel" <notagunzel@bigfoot.com>]

Stuart Ellis <mpp@zipworld.com.au> wrote in message
38654D90.853C775A@zipworld.com.au">news:38654D90.853C775A@zipworld.com.au...
> Notagunzel wrote:

> > This DPU device, does NSW use many of these?  I have to admit I'd never
> > heard of them used in NSW up to now, a similar sort of device was used
on
> > certain Track Circuits in Victoria in the height of the Sprinter panic,
but
> > AFAIK they were removed once the Sprinters got Track Circuit Assistors
> > fitted.  The Victorian Device (Track Shunt Device?) was a primary
battery
> > powered metal proximity detector which dumped a short across the rails
for x
> > seconds after a wheel passed them.

>  The DPU devices are now quite common in the inner Sydney area, ie
Sydenham,
> ESR, and the City circle. The primary purpose of introducing these devices
is to
> shorten the length of a track circuit without going to all the expense of
> installing extra track circuits. Especially where there is a  need for
close
> running of trains, ie the ESR line, and city circle line.

Ummm..., these may not be like the Track Shunt Assistors I was talking
about.  Are they used with Jointless Track Circuits?  If so, I think they
are also called Pin Point Detectors.

> I hope this helps

Of course. |-)

--
Mr Notagunzel.
Rail Transportation Connoisseur
notagunzel@bigfoot.com
(Regrets to announce there will be no further moves at
http://www.geocities.com/nota_gunzel
until further notice is issued from this office)