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How does the depth of ballast cushion affect rail section?

How does the depth of ballast cushion affect rail section? Correct Answer Depth is less, bigger the rail section

The selection of the rail section depends on many factors like heaviest axle loads, maximum permissible speed, type of sleepers and depth of ballast cushion. If the depth of the ballast cushion is less, then a bigger rail section has to be provided.

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