Re: "lost" trains

[RNS <steam3801@hotmail.com>]

This means that the same thing was happening that day as the day of
the Cowan bank accident, except on the down instead of the up!
Whilst the signal failures being experienced on Cowan Bank may not
have been the only reason for the accident, it was certainly a major
contributing factor.
Once again, if caution by the following interurban driver had been
excercised the accident either would not have happened, or it would
have been considerablly less serious.




On Mon, 27 Dec 1999 12:01:33 -0800, pdwyer
<pdwyerNOpdSPAM@ecn.net.au.invalid> wrote:

>In article <oN9lOHUiPEc2+rJjoWldEoJSHFdD@4ax.com>, RNS
><steam3801@hotmail.com> wrote:
>> A few months after the Cowan Bank accident block working was
>> introduced on the down between Cowan and Hawkesbury River before
>> NL35
>> was allowed to proceed because, according to the Cowan signalperson
>> "the signals are flashing red and green" !!!!
>
>And this means????
>
>Signalling systems are designed to be fail safe. That is, when they a
>train path is set and the way is clear, the signal will display a clear
>indication.
>
>If there is a problem with the system, such as an intermittent relay
>contact failure, fine points detection, faulty track relay etc, the
>system may 'fail' momentarily and recover. This leads the signal to go
>green 'it's clear' to red 'its not clear/systems sick' and vice versa.
>
>They probably introduced block working to prevent drivers slamming on
>the brakes and to reduce stress.
>
>Oh, and as for the sand, which some people STILL can't believe, is far
>more common to have whole 'heavy' trains disappear in shunting areas,
>rather than main lines, but it does happen.
>
>
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