Stations 46
Ridership 300,000,000 journeys per year
Opened 1977
(last extension in 1994)
Rolling stock MI 84, MI 2N, MI 09
Line length 108.5 km (67.4 mi)
Track gauge 1,435 mm (4 ft 8 12 in)
Route map

Map of RER line A

Cergy – Saint-Christophe
Cergy – Préfecture
Neuville – Université
TransilienTransilien Paris – Saint-Lazare Poissy
Conflans-Fin-d'Oise TransilienTransilien Paris – Saint-Lazare
TransilienTransilien Paris – Saint-Lazare Achères – Grand Cormier
Achères – Ville
Saint Germain-en-Laye
Le Vésinet – Le Pecq
Le Vésinet – Centre
Chatou – Croissy
Sartrouville TransilienTransilien Paris – Saint-Lazare
Nanterre – Ville
Houilles – Carrières-sur-Seine TransilienTransilien Paris – Saint-Lazare
TransilienTransilien Paris – Saint-Lazare Nanterre – Université
La Défense TransilienTransilien Paris – Saint-LazareTransilien La Défense Paris MétroParis Métro Line 1 Tramways in Île-de-FranceÎle-de-France tramway Line 2
Charles de Gaulle – Étoile Paris MétroParis Métro Line 1Paris Métro Line 2Paris Métro Line 6
Auber RERRER E Paris MétroParis Métro Line 3Paris Métro Line 7Paris Métro Line 8Paris Métro Line 9
Châtelet – Les Halles RERRER BRER D Paris MétroParis Métro Line 1Paris Métro Line 4Paris Métro Line 7Paris Métro Line 11Paris Métro Line 14
Gare de Lyon RERRER D TransilienTransilien Paris – Lyon Paris MétroParis Métro Line 1Paris Métro Line 14
Nation Paris MétroParis Métro Line 1Paris Métro Line 2Paris Métro Line 6Paris Métro Line 9
Val de Fontenay RERRER E
Saint-Maur – Créteil
Noisy-le-Grand – Mont d'Est
Le Parc de Saint-Maur
Noisy – Champs
La Varenne – Chennevières
Sucy – Bonneuil
Val d'Europe
Marne-la-Vallée – Chessy TGV
An MI 2N train at Charles de Gaulle – Étoile, with the SIEL information system visible.
An MS 61 train at Auber.

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).

Line A is one of the world's busiest lines, and the busiest line in Europe with over 1,200,000 passengers/day.[2] It is formed from the connection of the Saint-Germain-en-Laye-Nanterre line in the west to the VincennesBoissy-St-Léger line in the east. Two branches were added in the west, to Poissy and the new town of Cergy-Pontoise, and in the east to the new town of Marne-la-Vallée. The two latest extensions were to Cergy-Le Haut and Disneyland Paris.

A train arriving at Auber while the previous one has not completely cleared the platform, caused by the rapid pace of SACEM.
Inside an MI 84.
MI 09 at La Defense

With more than one million passengers per workday, line A is the busiest Parisian RER and metro line. 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. At least five major capital investment decisions can be directly traced back to this issue:

One simple (if partial) solution to the congestion problem that has never been implemented is a change in the seating configuration in the trains. The RER is unusual among high-capacity urban train networks in its attachment to transverse (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.


List of RER A stations

Platforms at Bry-sur-Marne.
Trains at Boissy-St.-Leger.


Lineside signal taken over by SACEM (X).


Line A provides two groups of services:

During off-peak hours, the Poissy – Noisy services operate every 20 minutes plus a La Défense – Noisy service every 20 minutes, and the St-Germain – Boissy and Cergy – Chessy services operate every 10 minutes.

Operations are very complex during peak periods, with an average of one train every 2 minutes (30 trains / hour) on the common trunk line in the busier direction (east to west in the morning, west to east in the evening), and one train every 2 min 30 sec in the other direction (24 trains / hour). The Marne la Vallée branch has the most intensive service.

Names of services

RER trains display a "nom de mission" or "name of service", not the name of the destination station. These are invented names designating (and distinguishing) individual services ("runs"), and are accompanied by a two-digit number, for example ZARA59 or DJIB72.

The first letter corresponds to the destination (gare d'arrivée):

Letter To Examples of names of services
D Noisy-le-Grand - Mont d'Est DYNO, DJIN, DOMI
N Boissy-St-Léger NELY, NAGA
Q Marne-la-Vallée – Chessy QUDO, QIKY, QBIK, QAHA
R La Varenne-Chennevières RHIN, RUDI
U Cergy – Le Haut UPAL, UDON, UXOL
W (empty train) WQWZ
X Le Vésinet – Le Pecq XUTI, XOUD
Y Rueil-Malmaison YCAR, YVAN
Z Saint-Germain-en-Laye ZARA, ZEUS, ZINC

The second letter corresponds to the stations served and the origin station: a letter can have different meanings, depending on the destination. For instance, second letter "E" indicates:

The third and fourth letters are used to form a pronounceable name, changed when the service number (odd 01-99 eastward, even 02-98 westward) reaches the maximum. For example, successive trains to Boissy-St-Léger are called NEGE96, NEGE98, then NELY02, NELY04, etc. Each service is uniquely identifiable, as there cannot be two "NEGE" services with the same number in the same day.

Services with the same first two letters serve the same stations, e.g. ZEBU, ZEUS and ZEMA (to Saint-Germain-en-Laye), or NEGE, NELY and NEMO (to Boissy-Saint-Léger). The letters ZZ generally indicate that the established service pattern was changed for an unspecified reason, generally a technical problem which disrupted operations.

Morning Peak

Every 10 minutes:

Evening Peak

Every 10 minutes:

Off Peak

In both directions every 10 minutes:

In both directions every 20 minutes:

Off-peak, a train is scheduled every 3 minutes 20 seconds between La Défense and Vincennes in both directions.

See also


  1. RATP. "Schéma directeur du RER A" (PDF) (in French). Archived from the original (PDF) on 1 March 2013. Retrieved 4 July 2012.
  2. (French) RER A – "10 secondes de retard, 15.000 voyageurs affectés !"
  3. "MI 09 tout neuf" [MI 09 Brand New] (in French). France: MetroPole. 5 December 2011. Archived from the original on 16 January 2012.

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