Disruption on line N extends into this Thursday, September 10, 2026. After a Wednesday already challenging, services continue in degraded mode between Versailles-Chantiers (Yvelines) and Paris-Montparnasse (Paris 15th), passing through several communes in the Hauts-de-Seine. The cause: an incident in the Sèvres area that has led the SNCF to operate direct trains during peak hours.
In practice, from 6:30 to 9:45, trains heading for Paris will not stop at any station between Versailles-Chantiers and Montparnasse. A similar arrangement had already been in place on Wednesday, September 9, in the late afternoon, from 3:45 to 7:45 p.m. The line is effectively turning into an express shuttle: convenient for departures from Versailles, but much less so for those waiting on the platform at Meudon.
During this window, seven stations will be skipped by trains heading toward Paris-Montparnasse, according to an alert issued by SNCF and reproduced on the Line N traffic info page.
Commuters in Viroflay, Chaville, Sèvres, Meudon, Clamart, Vanves and Malakoff are the first to be affected, and the wake-up call could be a bit rough for anyone with a meeting at the scheduled time.
The SNCF is keeping mum about the root cause of the problem. It cited an “incident affecting the tracks in the Sèvres area,” without detailing its nature or how long repairs will take. We still don’t know when the full service on Line N will be restored.
The sector is not unfamiliar with alerts. In February 2020, a landslide near Sèvres-Ville-d'Avray blocked the L and U lines, and then a ground subsidence near the tracks disrupted these two lines again in January 2025. However, nothing links these episodes to the current incident, which this time affects the N line on the Left Bank side.
Outside rush hour, trains return to their usual stops with one exception: Clamart station is not served in the direction toward Paris. The SNCF suggests a bit of railway gymnastics. You need to hop on a train toward Meudon, then catch another train in the opposite direction to head for Montparnasse. In short, you go back to go forward.
Another heads-up for night owls: until Friday, September 11, 2026, Clamart will also have no stop toward Paris each evening from 11 p.m., this time due to planned maintenance.
From Viroflay Rive Gauche, the RER C provides a gateway into Paris, with stops at Chaville-Vélizy and Meudon-Val-Fleury. Before you head this way, take a look at the RER C traffic status. The tramway T6 also departs from Viroflay Rive Gauche to connect with Châtillon-Montrouge and Line 13 of the metro.
In the Sèvres and Chaville area, the Transilien lines L and U stop at Sèvres-Ville-d'Avray and Chaville-Vélizy, with L heading to Paris-Saint-Lazare and U toward La Défense. Closer to the capital, Paris Metro line 13 at Malakoff-Plateau de Vanves can serve residents of Vanves and Malakoff.
To fine-tune your itinerary, the best option is to check your route right before you head out on Île-de-France Mobilités or via the SNCF Connect traffic info. The X account @lignesNetU_SNCF also relays updates on how the situation is evolving over the course of the morning.
The Sèvres incident adds to an already busy schedule on the ligne N, which runs from Paris-Montparnasse to Rambouillet, Mantes-la-Jolie and Dreux. Until September 30, 2026, on weekdays, service from Paris-Montparnasse toward Versailles-Chantiers will be suspended from 23:40, with replacement buses in place. New nightly outages are also planned starting Saturday September 12, detailed in our weekend disruption update for September 12-13, 2026.
Since the situation can change from hour to hour, a quick look at our real-time page for Line N traffic or at the roundup of disruptions from September 7 to 13, 2026 will spare you from waiting on the platform for nothing.
