Question

why there is a gap between in rails
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Answer 1

Answer:

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==>>These gaps which are of the order of a few millimeters, are provided to allow room for the rails to expand the rise in temperature due to the atmospheric temperature as well as the friction caused by running of train. All materials expand when heated and contract when cooled.

Answer 2

Answer:

if the rail are filled end to end leaving no gap, then on expansion, the rails would bend. To avoid this, rails are joined by a fish plate, leaving some gap between the rails.