A special reinforcement system has been put in place from 1 March 2026 to compensate for the modernisation work underway on the RER B. Reinforcement races are set up on weekday evenings from 10 p.m. to 1 a.m., and on weekends from:
- Saturday, March 21 to Sunday, March 22 during the day and evening
- Long weekend from Friday 8 May to Sunday 10 May during the day and evening
- Whit Monday long weekend from Saturday 23 May to Monday 25 May during the day and evening
In the evenings and during the weekends concerned, the Express line 9517 benefits from additional trips and extended schedules.
The reinforcement races are direct between Roissypôle station and La Plaine-Stade de France. They then serve the Stade de France - Saint-Denis stop and terminate at Saint-Denis Pleyel, in both directions.
You can find the reinforcement races (highlighted in blue) in the timetable below.
To find all the news from your territory, go to the X account (ex-Twitter): @ExpRoissy_IDFM