What's the current traffic situation on the RER B? Here's real-time information on current and future disruptions on this public transport line in the RATP-SNCF network. Work, incidents, demonstrations, strikes, industrial action - here's what to expect.
Linking the north and south of theParis region over an 80-kilometer route, the RER B opened in 1977 and today serves 47 stops, connecting residential and business areas across various départements. To the north, it departs fromCharles de Gaulle airport and Mitry-Claye in Seine-et-Marne, passing through Seine-Saint-Denis with key stops such as Aulnay-sous-Bois. Heading south, it reaches Saint-Rémy-lès-Chevreuse in the Yvelines to take us to the sublime Vallée de Chevreuse, crossing theEssonne with stops including Orsay and Bures-sur-Yvette.
In Paris, the RER B crosses several central arrondissements, offering direct access to points of interest such as the Latin Quarter and Jardin du Luxembourg in the 5th arrondissement, and the famous Parc Montsouris in the 14th. It also connects with the Stade de France in Saint-Denis, and the Villepinte exhibition center. The line also offers multiple connections with other RER lines(A, C, D, E) and several metro lines(4, 6, 10, 14).
If you're a regular user of this line in the RATP-SNCF network, here's where we share real-time information on traffic on the RER B public transport network in the Paris region. Whether it's work in progress, station closures, strikes orunforeseen incidents, we'll give you the lowdown on current and future disruptions on the RER B in Paris and the Ile-de-France region.
- RER B: Châtelet <-> CDG2 Airport / Mitry - Claye | 05/01-28/05:
Period: Weeknights starting at 10:45 PM.
Dates: from Monday, January 5th to Thursday, May 28th, excluding February 5th, April 6th, and May 1st, 8th, 14th, 15th, and 25th, 2026.
Service will be suspended between Châtelet Les Halles and Aéroport C. De Gaulle 2, as well as between Châtelet Les Halles and Mitry – Claye.
A replacement bus service will be available from Gare du Nord. For more information, visit the RER B website.
Reason: railway network maintenance. - RER B: Paris Nord to CDG2/Mitry-Claye – February 21 to February 28
Period: starting from 10:45 PM.
Dates: Saturday, February 21 and Saturday, February 28.
Train services will be interrupted between Paris Gare du Nord and Roissy-Charles de Gaulle 2, as well as between Paris Gare du Nord and Mitry-Mory.
A substitute bus service will operate from Gare du Nord, stopping at intermediate stations along the route. - RER B: Châtelet <-> CDG2 Airport / Mitry - Claye | May 1 – May 28
Period: Weeknights starting at 10:45 PM.
Dates: From Monday, January 5th to Thursday, May 28th, excluding February 5th, April 6th, and May 1st, 8th, 14th, 15th, and 25th, 2026.
Train services will be suspended between Châtelet Les Halles and Aéroport Charles de Gaulle 2, as well as between Châtelet Les Halles and Mitry – Claye.
Replacement bus services will be provided from Gare du Nord. For more details, visit the RER B website.
Cause: infrastructure work on the railway network. - RER B: Paris Nord to CDG2/Mitry-Claye, February 14-15 —
Service disruptions expected
Period: All day.
Dates: From Saturday, February 14 to Sunday, February 15.
Train services will be suspended between Paris Gare du Nord and Charles de Gaulle Airport 2, as well as between Paris Gare du Nord and Mitry-Claye.
A replacement bus service will operate, serving the intermediate stations. - RER B: Paris Nord <-> CDG2 Airport / Mitry - Claye, February 21–28:
Period: starting from 10:45 PM.
Dates: Saturday, February 21 and Saturday, February 28.
Train services will be suspended between Paris Gare du Nord and Aéroport Charles de Gaulle 2 and between Paris Gare du Nord and Mitry–Claye.
A replacement bus service will operate from Gare du Nord, stopping at intermediate stations along the route.
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