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In a railway track, two rails are joined end to end with a gap tin between them because?

ASteel can be saved

BAccidents due to contraction in winter can be avoided

CAir gaps are necessary for bearing the weight of running train

DAccidents due to expansion in summer can be avoided

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Correct Answer: D: Accidents due to expansion in summer can be avoided

Explanation: The correct answer is D: Accidents due to expansion in summer can be avoided. A gap is left between railway tracks so that accidents due to expansion in summer can be avoided. Metal expands when heated, so the gaps accommodate thermal expansion.

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