It was a difficult Tuesday morning for thousands of Ile-de-France residents. Since 8am on November 18, RER A, an artery used by 1.4 million travelers every day, has experienced some damage. A series of incidents on this line and on other lines of the rail network have turned platforms into saturation zones, causing massive delays and train cancellations.
Malfunctions, inconveniences, technical incidents…
It all started in the west. At 8am, SNCF announced the first disruption between the prefectures of Cergy-le-Haut and Nanterre: a train broke down in Achères-Ville, causing the first delay on the western branch of the RER A.
An hour later, at 9am, the situation worsened. RATP reported “severely disrupted” traffic across the route. Two new incidents have been added to the first: a passenger who felt unwell on board the train at Nation blocked the train at rush hour, while at Gare de Lyon a large influx of passengers created a saturation situation.
⚠️ Traffic is severely disrupted across the line due to delays to passengers from the disrupted line at Gare de Lyon and due to passenger discomfort on board trains at Nation #RERA
— RER A (@RER_A) November 18, 2025
This delay for travelers is an indirect impact of problems that occurred on metro line 14. At around 08.00, this line also experienced disruption due to a technical incident. At 09.00, RATP even indicated that there was traffic disruption between Madeleine and Châtelet before resuming at around 09.30. This damage has prompted some line 14 users to switch to RER A.
