Question

To avoid derailment of the train, small _______are left in between the rails.

Answer 1

1. Steel is the material used to make rails, and it expands on heating and contract on cooling.
2. If the rails are arranged without having space between them, they will bend outward due to the expansion or contraction during the summer season.
3. Hence, To avoid derailment of the train, small gaps are left in between the rails.