Definition: "RER" is an acronymn for Réseau Express Régional, or Regional Express Network, and refers to the rapid transit system which serves Paris and its surrounding suburbs. The RER currently has five lines, A-E, and is operated by a different company than the Paris metro. Learn all about how to use the Paris RER below.
More About the RER and Paris Public Transportation
Pronunciation: In French, RER is pronounced "EHR-EU-EHR"Audio Link
