A serious incident occurred Tuesday morning near Noisy-Champs in Seine-et-Marne. As a result, RER A train services are disrupted between Noisy-le-Grand in Seine-Saint-Denis and Noisiel until 9:30 a.m., affecting travel in both directions.
Today, Tuesday, December 17, 2025, travelers on the RER A line between Seine-Saint-Denis and Seine-et-Marne should brace for significant disruptions. Early this morning, a serious incident involving a person occurred near the Noisy-Champs station, leading to a complete shutdown of train services between Noisy-le-Grand and Noisiel. Traffic is not expected to resume on this section of the line until after 9:30 a.m. today.
Specifically, three stations are not served in both directions: Noisy-le-Grand Mont d'Est, Noisy-Champs, and Noisiel. Travelers aiming to reach Paris must depart exclusively from Noisy-le-Grand Mont d'Est. Conversely, those heading towards Marne-la-Vallée Chessy need to start their journey from Noisiel.
Early this morning, the disruption stretched from Noisy-le-Grand to Torcy, before gradually narrowing down to just the three stations mentioned. On X, the SNCF reported that services remain disrupted across the entire line, impacting the eastern branch of the RER A service heading to Marne-la-Vallée Chessy.
In response to this disruption, travelers stranded in the area have several fallback options. Bus services are the primary alternative for reaching operational train stations. From Noisy-Champs, lines 100, 213, 310, 312, and 320 of the Marne and Brie network provide connections to nearby stations.
For travelers aiming to reach Paris from this area, one viable option is to take the RER E line to either Yvris-Noisy-le-Grand or Villiers-sur-Marne - Le Plessis-Trévise. The RER E connects to the city center via Haussmann Saint-Lazare or Magenta Gare du Nord, providing a reliable alternative while the RER A line is temporarily out of service on this segment.
Travelers affected by this disruption can check real-time traffic updates via the Île-de-France Mobilités app or on the Transilien SNCF website. These tools help passengers monitor the evolving situation and anticipate delays. It’s also possible to consult real-time traffic information to plan alternative routes and find the best way to reach your destination promptly.
The RER A line, which runs east-west across Île-de-France, remains one of the most heavily used, with over a million passengers daily. This disruption affects a significant number of commuters during the busy morning rush hour, especially as the Noisy-Champs station also serves the Descartes Campus and Gustave-Eiffel University, areas frequented by many students.
The RER A is operated jointly by RATP and SNCF, with SNCF managing the Cergy and Poissy branches, while RATP oversees the rest of the network. In the event of significant disruptions like this one, both operators coordinate closely to restore service as quickly as possible.
Travelers are advised to regularly check traffic updates and allow extra time for their journeys this Tuesday morning. Service is expected to gradually return to normal after 9:30 AM, although some delays may still occur across the entire line. For any questions or additional information, you can contact Île-de-France Mobilités, the transit authority coordinating the entire Île-de-France network.
