Question

. Why are gaps left between lengths of rail in a
railway line?
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Answer 1

Answer:

because there is a contraction and expansions due to temperature change so there will be gaps left between of a rail in a railway line

Answer 2

Answer:

There are gaps because the lengths of a rail are metallic, and metal expands in summer.

So as to avoid any cracking there are gaps which the length of rails occupy in summer