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Commuter rail or suburban rail is a passenger rail transport service that primarily operates within a metropolitan area, connecting commuters to a central city from adjacent suburbs or commuter towns.[1][2][3] Commuter rail systems can use locomotive-hauled trains or multiple units, using electric or diesel propulsion.[2] Distance charges or zone pricing may be used.
The term can refer to systems with a wide variety of different features and service frequencies, but is often used in contrast to rapid transit or light rail.
Some services share similarities with both commuter rail and high-frequency rapid transit; examples include New Jersey Transit in the U.S., German S-Bahn in some cities, the Réseau Express Régional (RER) in Paris, the S Lines in Milan, many Japanese commuter systems, the East Rail line in Hong Kong, and some Australasian suburban networks, such as Sydney Trains. Many commuter rail systems share tracks with other passenger services and freight.
In North America, commuter rail sometimes refers only to systems that primarily operate during rush hour and offer little to no service for the rest of the day, with regional rail being used to refer to systems that offer all-day service.[4][5][6]