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Re: defect detectors?



"Bruce Greening" <norrail@optusnet.com.au> wrote in message
3AE54E49.96503DAC@optusnet.com.au">news:3AE54E49.96503DAC@optusnet.com.au...
>
>
> Mark wrote:
>
> > Group, are there defect detectors in australia, or just usa?
> > and if not, why is this just a usa system of safety.
> > thanks
>
> There are certainly Hot box detectors, wheel impact detectors, draging
> equipment detectors in use on several Aust. systems.
>

What do these look like, and what do they do??

--
pk