Question

give reason for the following. first while laying a redwrap, a small gap is left between two successive rails.
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Answer 1

Answer:

While laying the railway track a small gap is left between the two successive length of rails. The reason is that the rails expand in summer. The gap is provided to allow for this expansion. If no gap is left the expansion in summer will cause the rails to bend sideways.

Answer 2

Explanation:

because during summer iron expands and if there is no space then derailing might happen