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Broken Rail Question
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<p>Grade-crossing signals: There's many different ways that adjacent grade-crossing signals can be linked or not linked. If the grade-crossing signals are daxed together (downstream adjacent crossing), but are not equipped with grade-crossing predictors (GCP), then when one activates, the grade-crossing signals it is daxed to activate as well. If each crossing has a GCP and the GCP in the one that has a broken rail in its circuit shows no relative motion, then the daxed crossings will not activate (or may activate and then when the first GCP shows no relative motion, they will deactivate). If the break occurs in the island circuit then the gates are coming down on that crossing, period.</p><p>In other words there is no single rule of thumb.</p><p>Wayside signals: A broken rail may not shunt the track circuit unless it's a clean pull-apart. In my experience, these days, most rails that are "found" by a train also end up derailing the train. It seems more common that way than to have one left behind a train. Our rule has always been that anytime a train leaves a track light behind it, stop all movements over that block and call the roadmaster and signal maintainer. This is why it is so crucial to run detector cars on a regular basis.</p><p>S. Hadid </p>
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