why does a railway track have a particular shape like i in physics by using elasticity
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Upper half should be wide enough to support the wheel and lower half should be wide & thick enough for clamping. Taking out extra materials saves significant amount of iron without compromising over strength thus giving it the shape of what you asked.
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Explanation:
This is typical shape of the cross-section of a track laid with Flat-footed Rails. ... These are shaped so for following purposes: The top portion or the HEAD of the rail is thicker to take up the impact of the fast moving wheels, and carry the load of trains preventing abrasion of the tracks.
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