Why are gaps left between railway track?
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Small gaps which function as expansion joints are deliberately left between the rail ends to allow for expansion of the rails in hot weather. ... Because of these small gaps, when trains pass over jointed tracks they make a "clickety-clack" sound.
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4
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these gaps which are of the order of a few millimeter are provide to allow room for the rail to expand the rise in temperature due to atmospheric temperature as well as the friction caused by running of train
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