High Quality Content by WIKIPEDIA articles The RER (French pronunciation: French: R seau Express R gional, "Regional Express Network") is a rapid transit system in France serving Paris and its suburbs. The RER is an integration of a modern city-centre underground rail and a pre-existing set of commuter rail lines. It has several connections with the Paris M tro within the city of Paris. Within the city, the RER functions like the M tro, but as it has fewer stops, the system acts as one of express trains. Since 1999 the network has consisted of five lines: A, B, C, D and E. The RER is still expanding; Line E, which opened in 1999, is planned for westward extension by 2020.
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