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**RER A**
	hybrid suburban commuter railway line in Paris, France
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Instance of	branched subway line; cross-city route; commuter rail line;
Location	Paris; Seine-et-Marne; Yvelines; Hauts-de-Seine; Seine-Saint-Denis; Val-de-Marne; Val-d'Oise; France;
Transport network	Réseau express régional;
Owned by	Île-de-France Mobilités;
Operator	RATP; SNCF Voyageurs;
Date of official opening	8 December 1977;
Length	108.5 km;
Terminus	Poissy station (west); Saint-Germain-en-Laye station (west); Gare de Cergy-le-Haut (west); Boissy-Saint-Léger (east); Marne-la-Vallée—Chessy (east);
Replaces	ligne de Paris-Bastille à Marles-en-Brie;
Authority file
	Q741818; BabelNet ID: 02659061n; Structurae structure ID: 10000218; OpenStreetMap relation ID: 2333448
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