Re: Brief Signalling failure at Camberwell

["B." <b.spammed@four12.net>]

"Mark Bau" <markbau@earthlink.net> wrote in message news:B6FDE466.258F%>
markbau@earthlink.net...
> in article 3ad5c4e6$0$25499$7f31c96c@news01.syd.optusnet.com.au, B.
> at b.spammed@four12.net wrote on 4/12/01 9:06 AM:

>> The tracks at Camberwell will be plain 25Hz AC tracks.  AFAIK even
>> the High Voltage and Jointless tracks run straight off 24v
>> rectifiers off the AC sigs supply.  You can't use DC tracks in DC
>> traction territory, otherwise the return current would have this
>> habit of picking the tracks under the train.

> Many thanks for the info. Having never worked with signals in
> electrified areas your posting explained quite a lot to me, thank
> you.

> We do use a lot of A.C. but only so we can get different frequencies
> such as code transmission through the rails. Is there anything like
> "Electrocode" in Australia?

The NE CTC uses plain electro-mechanical coded track circuits in a limited
way, afaik not for control of aspects however.

Don't know what, if any, coded tracks are used on the Western CTC.

The South Line CTC in SA also used coded tracks, iirc there is now some GRS
trackode in a limited way.

I think one of the Pilbra Lines (BHP?) has Electrocode 4.

However, since Harmon have now got the job to install power signalling
between Newport & Gheringhap, and Maroona to Pyrenees, perhaps Victoria will
get some Electrocode gear afterall.

--
B.

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