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Railway tracks are typically laid on a mattress of stone monitor ballast or track bed, which in turn is supported by prepared earthworks generally known as the track formation. The formation includes the subgrade and a layer of sand or stone mud , generally recognized as the blanket, which restricts the upward migration of wet clay or silt. There can also be layers of waterproof fabric to forestall water penetrating to the subgrade. The basis may check with the ballast and formation, i.e. all man-made buildings beneath the tracks. Common upkeep jobs embrace altering sleepers, lubricating and adjusting switches, tightening unfastened observe elements, and surfacing and lining observe to keep straight sections straight and curves inside upkeep limits.
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