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The S sets are a type of double-decker electric multiple units (EMU) that formerly operated on Sydney's suburban rail network in New South Wales, Australia from 1972 up until 2019. Originally entering service under the Public Transport Commission, the sets also operated under the State Rail Authority, CityRail and Sydney Trains in later years. The S sets were originally designated into three classes, two-car L sets (originally T sets), four-car S sets, and six-car R sets.

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