Gravity shunting is a technique for sorting of railcars. The heart of the process is the hump: a lead track on a hill (hump) over which the cars are pushed by the engine. Single cars, or some coupled cars in a block, are uncoupled just before or at the crest of the hump and roll by gravity into their destination tracks in the classification bowl (the tracks where the cars are sorted). (Source: Rail Cargo, "Rail infrastructure glossary")

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