What is the purpose of a tamping machine

What is the purpose of a tamping machine
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Tamping refers to lifting and correcting the longitudinal and vertical alignment of the track by squeezing ballast stone into the void created under the sleeper due to the lift. Tamping machines are either of the index or, for high production, continuous action design. Index tamping machines stop at every sleeper or sets of sleepers to be tamped whereas continuous action tamping machines separate the main frame and a satellite frame on which the tamping units are mounted to allow continuous motion of the main frame while the cyclic braking and acceleration for the tamping action is performed by the much lighter satellite frame. This together with the number of sleepers tamped per insertion determines the production of the machine. Many different specialised machines have been developed by Plasser & Theurer to address the various aspects of tamping but are basically divided between plain track and universal machines.
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