The rail is designated by its A. length B. weight C. cross-section D. weight per unit length

The correct answer is C. cross-section.

A rail is a long, thin piece of metal that is used to support the weight of a train. The cross-section of a rail is the shape of its cross-section, which is the area that is perpendicular to the length of the rail. The cross-section of a rail is important because it determines the strength of the rail. A rail with a larger cross-section will be stronger than a rail with a smaller cross-section.

The other options are incorrect because they are not relevant to the strength

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