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It's the regional métro network in the Paris (Ile de France) Region - Réseau Expresse Régionale. (I live near it) The lines don't have numbers, they have letters - RER Ligne A, Ligne B, Ligne C and so on. It's operated jointly by the RATP and the SNCF and covers a wide distance around Paris (la Grande Banlieue).

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15y ago

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