RER B works: dates, times and alternatives in November and December 2026 Last updated: November 2, 2026
As part of modernization works, the RER B line will be affected by works on several dates and sections in 2026. These closures will directly affect your journeys: find the schedule and our tips in this article.
Key dates
As part of the work on the RER line 
, service interruptions are scheduled on the following routes:
🚫 Aéroport Charles de Gaulle 2-TGV / Mitry-Claye <> Châtelet – Les Halles in the evening:
Service suspended from 10:45 p.m. on weekdays and some weekends, until December 11.
🚫 Aulnay-sous-Bois <> Mitry-Claye, all day:
- the weekend of November 7 and 8,
- the weekend of November 21 and 22.
🚫Aulnay-sous-Bois <> Aéroport Charles de Gaulle 2-TGV in the evening:
Service suspended from 10:45 p.m. from December 14 to 18.
Normal service between Châtelet-les-Halles, Aulnay and Mitry-Claye.
Alternative routes
Click on the diagrams to see all the alternatives based on your starting point and destination🚫 Aéroport Charles de Gaulle 2-TGV / Mitry-Claye ↔ Châtelet – Les Halles
Replacement buses will be provided, and regular bus service will be increased. You can take the recommended alternative routes shown in the diagram below, allowing for a longer journey time.
🚫 Aulnay-sous-Bois <> Mitry-Claye
A replacement shuttle (shuttle B3) will operate during this period.
🚫 Aulnay-sous-Bois <> Aéroport Charles de Gaulle 2-TGV
Replacement bus B4 will operate during this period.
Adapt your journeys with the Bonjour RATP app
🔎 Find the best route
Start a route search: the results anticipate disruptions to help you avoid construction areas. Then customize according to your needs: schedules, transport modes, lines or stations to avoid…
🚦 Check live traffic information
Access real-time traffic status via the app's Traffic tab. You can enable personalized alerts to be notified when your lines are affected.
📹 Demo: follow traffic updates with the app
The Bonjour RATP app: your ally for anticipating disruptions and
finding the best routes during construction work
