On Thu, 13 Oct 2016 21:03:05 +0100 (GMT+01:00), jim <k> wrote:
It will be part of a setup that will also automatically be turning the
railway signals to the stop indication so hopefully no train will
come along and hit an aircraft or wreckage of one that has encroached
upon the track, Gatwick has a similar system even though the trains
there are powered by 3rd rails about a foot above the ground.
A couple of other airports also have railway signals activated by
tripwire systems, Southend and Manchester have them .
The systems primary purpose are to stop trains , a diesel powered one
could come barreling along even if the power has been disconnected.
So somewhere the system will be connected to the power supply control
but there won't be a big switch pulled to off by the tripwire
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