Question

why is a little gap provided between two railings?

Answer 1

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.

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Answer 2

it is provided to allow the btw the rails to expand the rise in temperature as well as friction caused by train . materials expand when it is heated and contracts when it is cooled