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yep, you guessed it right, that is a high/wide detector. More than likely there is a truss <br />bridge(s) somewhere around there not too far from the detector and even though it's mostly coal and grain, there is some general stuff on that line and all it takes to do some real damage to a bridge is one time, so it's a useful item to have, especially if the bridge doesn't have an awful lot of clearance where it wouldn't take much of a shift to smack it. that detector works by if something hits those wires hard enough to rip 'em off, it triggers, then a signal maintainer has to come out and put in new wires. this is the less expensive version (probably due to a lack of a lot of shiftable traffic as you noted) the other version uses an optical or laser sensor which doesn't require reseting after tripping, so i figure they're (UP) not expecting anything to trip it very often. later <br />derek
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