At 05:34 AM 18/07/2013, you wrote:
>Hello all,
>
>Is there any method to detect an oncoming train about 2 KMs away?
>
>One method that I have thought off is to use a condenser microphone
>AND/OR Piezo diaphragm to check the sound/vibration level. I do not know
>the success rate of this method.
>
>Any ideas?
>
>Cheers
>
>Ravi

Maybe a geophone would be better.

--sp

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