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Loram
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Since it is assumed that trains wear down rails, it seems counter intuitive that grinding material off of rails would prolong their life. But as I understand it, the manganese steel used in rails is rather plastic in nature. It is tough but not brittle. So the surface of rails develops ripples similar to a washboard road. You can see the ripples reflected in back- lighting. The ripples impede the rolling wheels, thus causing more resistance to trains, and that extra resistance further contributes to the disruption of the rail surface. So grinding off the ripples restores the smooth surface and eliminates the rolling resistance. It is like grading a washboard road.
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