Storms: which train lines are still disrupted on Sunday, June 28 in Île-de-France?

After a week of a record heatwave, violent storms hit the Île-de-France and especially the Yvelines (78) in the night of June 27–28, 2026. Gusts exceeding 100 km/h, hail, fallen trees and above all lightning: the Paris-region rail network bears the scars this Sunday. Several electrical installations of the SNCF were damaged in the Saint-Quentin-en-Yvelines area, and traffic remains heavily disrupted on the N and U lines of Transilien at 6 p.m.

Which Transilien and RER lines are affected by the storms?

Six lines were interrupted or severely slowed at the height of the storm. The lightning hit especially the Line N, on which some branches remain cut off this late afternoon.

• Ligne N (Montparnasse to Rambouillet, Dreux and Mantes): the line hardest hit, with closures between Versailles Chantiers and La Verrière, and between Rambouillet and Saint-Cyr, and disruption across the rest of the line.


• Ligne U (La Défense to La Verrière): severely disrupted, in the Saint-Quentin-en-Yvelines corridor.


• Ligne J (Saint-Lazare to Mantes and Gisors): among the most affected tonight. Service suspended between Pontoise and Gisors (restart estimated around 23:15) and between Sartrouville and Mantes-la-Jolie, with no resumption planned before the end of service.


• Ligne L (Saint-Lazare to Cergy, Versailles and Saint-Nom-la-Bretèche): traffic slowed overnight.


• RER B: slowdowns stemming from the storms.


• RER C: service disrupted between Brétigny and Dourdan due to an obstacle on the track, on a line already weakened by earlier incidents.

This Sunday evening, the SNCF is maintaining the disruption on the most badly damaged sections of the Line N until early in the evening, and does not rule out the possibility that the situation won’t be fully restored by Monday morning. Fixing the facilities struck by lightning is taking time, especially since some trains sent to the workshop after being damaged still need to be returned to service.

• To be read
• This week's best tips and deals in Paris and Île-de-France, June 29–July 5, 2026

The damage extends beyond the Île-de-France network. Because electrical installations in Yvelines have been damaged, service is also interrupted between Le Mans and Paris this Sunday, with some connections on this axis to Montparnasse cancelled. Good news for long-distance trips: TGV trains are not affected by this outage.

Before heading to a station in the area, it's wise to check real-time traffic on SNCF Connect, the Île-de-France Mobilités app, or Transilien, as well as the social media accounts of the affected lines. SNCF is urging travelers to postpone non-essential trips. Driving remains a fallback, but the roads in Yvelines are likely to be busy, with some routes still clogged by fallen trees.

Metro, RER and roadworks: other disruptions on Sunday, June 28

Beyond the storms, this Sunday remains difficult for other reasons. The region has returned to orange heat alert, and SNCF is keeping preventive cancellations on the RER and Transiliens to protect the tracks after a week of historic heat. On the construction side, the RER B is shut all weekend toward Robinson, with replacement buses at Porte d’Orléans, while the line J and the RER A are interrupted between Paris and Poissy. The Line 13 of the metro has also been running with disruptions up to midday. And starting this evening, several nighttime work-related interruptions will affect the RER C, the RER D, and the RER E. The full details are in our weekend disruption update.

As conditions on the ground show, with the end of the heatwave, storms and the start of summer roadwork, western Île-de-France is currently grappling with a squeeze of constraints. Caution remains warranted over the next few hours, with Météo-France maintaining the yellow thunderstorm alert for the region until Monday, June 29, 2026.