Rail grinding significantly increases the friction between rail and wheel and can contribute to truck steering problems where a wheel will crab and scuff the inner gage of the rail rather then slide smoothly along. In extreme cases it can contribute to a derailment. Adding a bead to the top of the rail helps reduce this friction.
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Just 1 nail holding the rail down? I know we can't see the other side of the rail, but would it not be better to check rail security before regrinding it?
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One spike on each side is all you need on tangent track, curves, however, are a different story
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