Question

explain the rails have gaps at specific distances
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Answer 1

Answer:

All solids expand on heating. As rails are made up of steel, these also expand in summers and contract in winters. These expansions and contractions can cause sagging and bending of rails which could derail the trains running on them. Thus, the rails have been provided with gaps at a specific distance so as to prevent this bending of rails. These spaces get closer in summers and wider in winters.

Answer 2

Answer:

It is a known fact that all solids tend to expand on heating. As rail lines are made up of steel, they tend to expand during summers and contract in winters. However, these expansion and contraction can cause sagging and bending of railway tracks which could derail the trains that run on them. Thus, the rails are provided with gaps at specific distances so as to prevent this bending of rails and avoid derailing of trains. These spaces get closer in summers and become wider in winters.