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RER

proper noun

initialism of Réseau Express Régional, a Parisian tram, train and bus system

Réseau Express Régional (Regional Express Network)

noun, masculineplural: RERs

A commuter rail or overground system, especially one with relatively high speeds and widely-spaced stations in urban areas.; Conventional translation of German S-Bahn in German-speaking regions of Switzerland, regardless of whether a system would otherwise be classed as an RER.

Réseau Express Régional (Regional Express Network)