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Hotbox detection, wheel flat detection
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In my experience as both a conductor and dispatcher I have found that both kinds of detectors give false alarms. I regularly rode on long freights over our one impact detector on the Indy line and I would get a wheel impact about 130 cars deep only to find that particular wheel and the wheels of surrounding cars are just fine. There are two levels of impacts, a level 1 or level 2. Level 2's are taken seriously and the car is usually set out reguardless of what the conductor finds. <br /> As far as hot box detectors, trains have been stopped for what is thought to be no problem. But, if a train is stopped two times for the same axle the car or engine is set out without question. <br /> When it comes to detectors it's better to be safe than sorry. If something is indicated and it seems border line; as in the wheel is warm, but doesn't melt the temple stick, OR there is a small flatspot on the wheel but below the prescribed size to set the car out I'm usually going to have to the crew set the car off because you never what could happen down the road. It would also look really bad if a derailment were to occur and then it's documented that no action was taken to correct the situation.
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