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Network Rail
Buckled rail - Network Rail
Rails expand and contract due to thermal expansion and contraction of materials.
info railway:
Expansion is not only during summer. Rails expands when temperature increases and contracts when temperature decreases. So, in a particular day, in normal weather conditions, Rails will be in expanded state during mid noon and in contracted state in midnight or early morning.
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Rails are made from Steel which has the physical property of expansion and contraction during temperature variations. Almost majority of materials have this property of getting expanded when heated and contracted when cooled.
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