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RER A

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{{Infobox Paris Network| Line=RER A| ColourName=#fe370f| TextColour=White| YearOpened=1977| LastExtension=1994| RollingStock=MS 61, MI 84, MI 2N| StationsServed=46| LengthKm=108.5| AverageInterstation=2,411| LengthMiles=67.4| AnnualPassengers=272,800,000| }} Image:RER-A Etoile.jpg thumb|300px|right|The RER A at [[Charles de Gaulle - Etoile (Paris Metro)|Charles de Gaulle - Etoile.]] Image:RER-A Etoile 2.jpg thumb|300px|right|People leaving and getting in the [[RER.]] The '''RER A''' is one of the five lines in the RER subway system serving Paris, France. The line runs from ''Saint-Germain-en-Laye (RER A1 A1), Cergy Le Haut (RER A3 A3), and Poissy (RER A5 A5). To Boissy-Saint-Léger (RER A2 A2) and Marne-la-Vallée - Chessy (RER A4 A4)'' * First inauguration : December 9, 1977 * Length : 108.5 km (67.4 miles) * Number of stops : 46 * Traffic (2004) : 272,800,000 journeys per annum ''(figure only for the RATP section of the line)'' Line A is formed from the connection across Paris of the Saint-Germain-en-Laye-Nanterre line in the west to the Vincennes (France) Vincennes - Boissy-St-Léger line in the east. Two branches were added in the West, to Poissy and the 'ville nouvelle' of Cergy, and another in the East, to the ville nouvelle of Marne-la-Vallée. The two latest extensions of the line were to Cergy - Le Haut (SNCF) Cergy-Le Haut and Disneyland Resort Paris.

Popular success and responses
Line A has been a runaway success since its inauguration and, with its million-plus passengers per workday, has frequently been presented as the busiest urban transit line in the world. This claim has been disputed (Gerondeau C, 2003 — see reference) by reference to the figure of 103,080 passengers per hour claimed by the Japanese Ministry of Transport for the JR Chuo Line in Tokyo — almost twice the equivalent figure (55,000) for the RER Line A (both 1992). Japan being something of a case apart in the field of rail transport, accounting for 40% of all train journeys in the world, it clearly remains the case that the RER Line A is an exceptionally busy route. Ever-increasing traffic volume and the need to ward off imminent saturation have been major factors in RATP and SNCF's planning since the inauguration of the Line A. At least five major capital investment decisions can be directly traced back to this issue: * In the early 1980s RATP contracted German conglomerate Siemens AG Siemens to develop a dynamic traffic control system that would remove the capacity constraints caused by conventional block traffic management. This system, called SACEM (''Système Automatique de Contrôle, d'Entretien et de Maintenance''), remains today one of the world's most advanced traffic control systems and enables extremely short spacing (well under 90 seconds) between trains during rush hour. (Parisians have become used to the somewhat surreal sight of a train pulling into a station as the one before it is just clearing the platform!) * Around the same time, RATP had to order a significant number of additional MI79/MI84 trains to remedy premature wear and tear on its existing MS61 rolling stock caused by over-utilization of Line A. * Later in the 1980s, the need to relieve congestion on the central segment of Line A was a key factor in selecting the route of the new, fully automated Paris Metro Line 14 Line 14 (also known as METEOR) of the Paris Metro Métro. Image:RER-A.jpg thumb|300px|left|Inside an RER A.. * The same need governed the choice of the route of RER Line E in the early 1990s and is a factor in current plans for that line's westward or south-westward extension. * An entirely new class of double-decker trains (MI2N series) entered service in 1998, in part a product of RATP's belief that no further infrastructure improvement (short of an extremely expensive track quadrupling) would relieve congestion on Line A. One simple (if partial) solution to the congestion problem that has never been implemented is a change in the seating configuration inside the trains themselves. The RER is unusual among high-capacity urban train networks in its attachment to "transversal" (front and back facing) seating. A change to "longitudinal" (sideways window-lining) seating typically reduces the number of seats by 10% but increases standing room by 30%. The result is increased capacity and a less cramped ride for those without seats.

Chronology
* '''December 14th, 1969''' : The company operating Paris subway, the RATP, buys the "ligne de Vincennes" from the SNCF which was connecting Bastille to Boissy-Saint-Léger in the East side. A new tunnel has been built between Vincennes and Nation (Paris RER) Nation, which replaces Bastille as the new terminus. * '''February 21st, 1970''' : The RATP buys the "ligne de St-Germain" from the SNCF which was connecting Gare Saint-Lazare St-Lazare train station to St-Germain-en-Laye in the West side. A new tunnel has been built between La Défense and the Place de l'Etoile, which replaces St-Lazare as the new terminus. * '''November 23rd, 1971''' : The "ligne de St-Germain" is extended from the Place de l'Etoile to the new station Auber through a new tunnel. * '''December 9th, 1977''' : Both lines are connected through a new tunnel giving the birth to the '''RER A''' line. Two new stations are inaugurated : Châtelet - Les Halles (Paris RER) Châtelet-les Halles and Gare de Lyon. A new branch is created in the East side from Vincennes to Noisy-le-Grand. * '''December 19th, 1980''' : The line is extended from Noisy-le-Grand to Torcy. * '''May 29th, 1988''' : A new branch is created in the West side from Nanterre to Cergy. * '''1989''' : Another branch is created in the West side from Maisons-Laffitte to Poissy. * '''1994''' : The line is extended from Torcy to Marne-la-Vallée in order to create a junction from Paris center to Disneyland Paris. It is also extended from Cergy-St-Christophe(RER) Cergy-St-Christophe to Cergy - Le Haut (SNCF) Cergy-Le Haut the same year.

Map
Image:RER_A.gif thumb|800px|center|Geographically accurate path of the RER A

List of RER A stations
* A1 ** Gare de Saint Germain-en-Laye Saint-Germain-en-Laye ** Le Vésinet – Le Pecq (Paris RER) Le Vésinet – Le Pecq ** Le Vésinet – Centre (Paris RER) Le Vésinet – Centre ** Chatou – Croissy (Paris RER) Chatou – Croissy ** Rueil-Malmaison (Paris RER) Rueil-Malmaison ** Nanterre – Ville (Paris RER) Nanterre – Ville ** Nanterre – Université (Paris RER) Nanterre – Université * A3, A5 ** A3 *** Cergy - Le Haut (SNCF) Cergy – Le Haut *** Cergy – Saint-Christophe (SNCF) Cergy – Saint-Christophe *** Cergy – Préfecture (SNCF) Cergy – Préfecture *** Neuville – Université (SNCF) Neuville – Université *** Conflans – Fin d'Oise (SNCF) Conflans – Fin d'Oise *** Achères – Ville (SNCF) Achères – Ville ** A5 *** Poissy (SNCF) Poissy *** Achères – Grand Cormier (SNCF) Achères – Grand Cormier ** Maisons-Laffitte (SNCF) Maisons-Laffitte ** Sartrouville (SNCF) Sartrouville ** Houilles – Carrières-sur-Seine (SNCF) Houilles – Carrières-sur-Seine * Nanterre – Préfecture (Paris RER) Nanterre – Préfecture * La Défense (Paris Metro, RER, and Transilien) La Défense * Charles de Gaulle - Etoile (Paris RER) Charles de Gaulle - Étoile * Auber (Paris RER) Auber * Châtelet - Les Halles (Paris RER) Châtelet - Les Halles * Gare de Lyon * Nation (Paris RER) Nation * Vincennes (Paris RER) Vincennes * A2 ** Fontenay-sous-Bois (Paris RER) Fontenay-sous-Bois ** Nogent-sur-Marne (Paris RER) Nogent-sur-Marne ** Joinville-le-Pont (Paris RER) Joinville-le-Pont ** Saint-Maur – Créteil (Paris RER) Saint-Maur – Créteil ** Le Parc de Saint-Maur (Paris RER) Le Parc de Saint-Maur ** Champigny (Paris RER) Champigny ** La Varenne – Chennevières (Paris RER) La Varenne – Chennevières ** Sucy – Bonneuil (Paris RER) Sucy – Bonneuil ** Boissy-Saint-Léger (Paris RER) Boissy-Saint-Léger * A4 ** Val de Fontenay (Paris RER) Val de Fontenay ** Neuilly-Plaisance (Paris RER) Neuilly-Plaisance ** Bry-sur-Marne (Paris RER) Bry-sur-Marne ** Noisy-le-Grand – Mont d'Est (Paris RER) Noisy-le-Grand – Mont d'Est ** Noisy – Champs (Paris RER) Noisy – Champs ** Noisiel (Paris RER) Noisiel ** Lognes (Paris RER) Lognes ** Torcy (Paris RER) Torcy ** Bussy-Saint-Georges (Paris RER) Bussy-Saint-Georges ** Val d'Europe (Paris RER) Val d'Europe ** Marne-la-Vallée – Chessy (Paris RER) Marne-la-Vallée – Chessy

See also
* List of stations of the Paris Métro * List of stations of the Paris RER

External links

- RATP official website ''(in French)''
- RATP english speaking website
- Interactive Map of the RER (from RATP's website)
- Interactive Map of the Paris métro (from RATP's website)
- Mobidf website, dedicated to the RER (unofficial) ''(in French)''
- Metro-Pole website, dedicated to Paris public transports (unofficial) ''(in French)'' Category:Paris RER Category:Paris metro cs:RER A de:RER A (Île-de-France) fr:RER A

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