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The yellow derailers you see are used to protect main tracks from being fouled by cars or locomotives spotted on a side track. They work by guiding the flange of the wheel up and over the railhead, causing the car or locomotive to derail before rolling onto a main track. A retarder is something used mainly in gravity hump yards, which mechanically squeezes the flange of the wheel against the rail to slow, or retard, the car being humped. I am not sure, but I believe that the car being humped is weighed as it begins to roll, and then the retarders are applied at different pressures against the flanges depending on the weight and how far the car has to roll. Anyone have a good answer to that?
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