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yes they are set to err on the side of safety. It doesn't happen too often, usually, but occaisionally you get one that goes "crazy" and it will stop every single train that goes over it until a signal maintainer comes and fixes it. just a little side note, if a detector get you and it's false and then the next detector gets you and it's the same car, even if you check it and it is o.k., you have to set the car out (at least on the UP you have to), so they are erring again on the side of safety.
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