A retarder is a device used to slow down or control the speed of a train, typically on steep slopes or in situations where quick stopping is necessary. It works by applying friction or resistance to the train's movement, helping to prevent excessive speed and ensuring the train stays under control. Retarders are often used in rail yards, where trains need to be safely slowed as they approach station platforms or other tracks. This system enhances the safety and efficiency of train operations.

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