A signal failure is causing major disruptions to the rail network west of Paris this Friday, February 6, 2026. Since 7:45 a.m., train services on the L line have been completely suspended between Nanterre Université (Hauts-de-Seine) and Cergy-le-Haut (Val-d’Oise), in both directions. This situation is seriously disrupting the morning commute for commuters in Île-de-France during rush hour. SNCF estimates that trains will start running again around 9 a.m. This ongoing disruption is considerably impacting the morning routines of those traveling in the region.
A signal failure at the traffic lights in the Acheres-Ville area is causing this disruption, according to SNCF on X. The railway operator anticipates a return to normal around 9 a.m., but passengers are advised to stay alert for real-time updates.
Specifically, the stations of Nanterre-Universite, Houilles-Carrieres-sur-Seine, Sartrouville, Maisons-Laffitte, Acheres-Ville, Conflans-Fin-d'Oise, Neuville-Universite, Cergy-Prefecture, Cergy-Saint-Christophe, and Cergy-le-Haut are currently out of service until the issue is resolved. With around ten stations affected, the disruption has a significant impact on daily commuters relying on this route.
And that’s not all: the RER A, which also serves these stations in the area, is experiencing significant major disruptions. Travelers passing through La Défense or heading towards Cergy and Poissy should expect considerable delays and canceled trains. For those able to, it might be wise to turn to RATP and Transdev bus services covering the region, or to consider telecommuting if that’s an option.
Incidents related to railway signaling are, unfortunately, not uncommon across the Île-de-France network. Just a few weeks ago, there was a notable electrical failure at Saint-Lazare in early February, which disrupted train services on lines L and J. Traffic signals play a crucial role in ensuring safety and regulating train movements: when they fail, it becomes impossible to run trains without risking accidents. SNCF Réseau must then deploy technical teams to the site to diagnose and repair the malfunction before services can resume normally.
To stay updated on the situation in real time, we recommend checking the Transilien website or the SNCF Connect app, which provide regular updates on traffic conditions. The Île-de-France Mobilités app is also a handy tool for finding alternative routes. You can also keep an eye on the dedicated feeds for Line L on X and the RER A. To get a comprehensive overview of transport disruptions across Île-de-France this week, don't hesitate to visit our dedicated page, updated daily. In short, if you plan to take Line L or the RER A this morning in the western sector, arm yourself with patience and make sure to check traffic conditions before heading out.
