RER line A is one of the five lines in the RER rapid transit system serving Paris France.The line runs from the western termini of Saint-Germain-en-Laye (A1) Cergy Le Haut (A3) and Poissy (A5) to the eastern termini of Boissy-Saint-Léger (A2) and Marne-la-Vallée – Chessy (A4).
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