RER A: traffic disrupted or interrupted, real-time information on the line

Introduced into service in 1977, the RER A is now one of Europe's busiest regional express train lines. Spanning 109 kilometers, this line crosses theÎle-de-France region from east to west, with 46 stops serving several towns in the region. These include Saint-Germain-en-Laye and Poissy in Yvelines; Nanterre and Rueil-Malmaison in Hauts-de-Seine; Noisy-le-Grand and Torcy in Seine-et-Marne; Cergy and Neuville-sur-Oise in Val d'Oise; and Vincennes and Fontenay-sous-Bois in Val-de-Marne.

Along the RER A line, you'll find a number of places worth a visit, including Disneyland Paris, the famous theme park in Seine-et-Marne, the Château de Vincennes, the Château Saint-Germain-en-Laye, home to the national archaeology museum, and the La Défense business district.

On its Paris section, the RER A also connects several attractive areas: Charles-de-Gaulle Etoile, at the top of theChamps-Elysées avenue and at the foot of theArc de Triomphe; Auber station, which connects with the department stores of boulevard Haussmann, theGarnier Opera district and Gare Saint-Lazare; Châtelet in the heart of the capital; Gare de Lyon and Nation. The RER A line crosses several major routes in the Paris transport network, offering connections with metro lines 1, 2, 4, 6, 9 and 14, as well as RER lines B and D.

• To be read
• This week's top picks in Paris and Île-de-France for May 4–10, 2026.

Are you an RER A commuter in the Paris region? We bring you real-time information on traffic on this line. Technical or passenger incidents, industrial action, traffic disruptions or slowdowns, station closures or construction work- here's the latest on current or forthcoming disruptions on the RER A.

• RER A: Nanterre-P <-> Achères-Ville and Nanterre-P <-> Poissy 04-06/05:
  Period : from 10:00 PM.
  Dates : from Monday, May 4 to Wednesday, May 6.
  Traffic is suspended between Nanterre Préfecture and Achères-Ville and between Nanterre Préfecture and Poissy.
  To reach Poissy, you will need to take Line L at Paris Saint-Lazare. Line L will be unusually extended between Maisons-Laffitte and Poissy. Shuttle trains will be operated between Poissy and Cergy–Le Haut.
  Reason : works.
• RER A: Maisons-Laffitte <-> Cergy le Haut, May 11–12:
  Period: starting at 9:50 p.m.
  Dates: from Monday, May 11 to Tuesday, May 12.
• RER A: Maisons-Laffitte <-> Cergy le Haut 01-18/06 Monday to Thursday:
  Period : Monday to Thursday, starting at 9:50 p.m.
  Dates : Monday, June 1 to Thursday, June 18.
  Traffic is suspended between Maisons-Laffitte and Cergy le Haut.
  A replacement bus service will operate from Sartrouville, serving the intermediate stations.
  Reason : maintenance work.

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