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From: larry@kitty.UUCP (Larry Lippman)
Newsgroups: net.analog
Subject: Re: Spoofing traffic signals
Message-ID: <1044@kitty.UUCP>
Date: Tue, 20-May-86 10:20:28 EDT
Article-I.D.: kitty.1044
Posted: Tue May 20 10:20:28 1986
Date-Received: Sat, 24-May-86 00:19:49 EDT
References: <840@ihu1h.UUCP> <37700004@hpcvlo.UUCP>
Organization: Recognition Research Corp., Clarence, NY
Lines: 20
Summary: That will do it...

In article <37700004@hpcvlo.UUCP>, bill@hp-pcd.UUCP (bill) writes:
> 
> OK, so setting traffic lights aside, can you tell me how to trigger
> a railroad crossing?  A friend of mine claims that he once did it by
> shorting the two rails together near the crossing with a piece of heavy
> wire ...

	Yup, that will trigger the railroad crossing signal.  It requires
a fairly low resistance path (i.e., a good connection) to trigger a track
signal, since the signal must be immune to wet weather conduction, and the
track relay is therefore not very sensitive.
	I wouldn't recommend making a habit of doing this, since it might
be a bit upsetting to the railroad, as the signal operation might be
interpreted as a "train" in the particular block of track.

==>  Larry Lippman @ Recognition Research Corp., Clarence, New York
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