The RER A is one of the five lines in the
RER urban rail system serving the
Île-de-France région, notably
Paris and its agglomeration.The line runs from Saint-Germain-en-Laye (
A1), Cergy Le Haut (
A3), and Poissy (
A5). To Boissy-Saint-Léger (
A2) and Marne-la-Vallée - Chessy (
A4)First inauguration:
December 9,
1977Length: 108.5 km (67.4 miles)Number of stops: 46Traffic (2004): 272,800,000 journeys per annum (figure only for the RATP section of the line)
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