Line U and Line N: Transilien trains completely suspended on July 11 and 12.

Heads up if you must travel on the Transilien U and N lines this weekend of July 11-12, 2026. Several outright service suspensions are announced on major corridors in the Yvelines, notably between La Défense and La Verrière, Versailles-Chantiers and Rambouillet, as well as between Plaisir-Grignon and Mantes-la-Jolie. According to the official recap of the works on the N and U lines, these disruptions are linked to network maintenance and repairs of electrical installations in the Saint-Quentin-en-Yvelines area.

On the Transilien Line U, no trains run between La Défense and La Verrière from Saturday, July 11 at 6:00 PM to Sunday, July 12 at 1:00 PM. A disruption to plan for if you’re traveling via Versailles-Chantiers, Saint-Quentin-en-Yvelines, or Trappes, especially since this stretch often serves as a link between western Paris and the La Verrière area. Replacement buses are scheduled for the duration of the interruption.

• Saturday, July 11, 2026 — U line: service interruption between La Défense and La Verrière from 6:00 PM.
  • Last train from La Défense: 7:14 PM.
  • Last train from La Verrière: 6:05 PM.
    
    
• Sunday, July 12, 2026 — U line: gradual resumption from around midday.
  • First train from La Verrière: 1:05 PM.
  • First train from La Défense: 2:15 PM.

The Transilien Line N is also hit by a major disruption between Versailles-Chantiers and Rambouillet. No trains will run from Saturday, July 11 at 6:30 p.m. to Sunday, July 12 at 1:30 p.m. This outage hits a heavily used southwest corridor of the Île-de-France region, linking Versailles, Saint-Cyr, Trappes, Coignières, Le Perray and Rambouillet. The disruption is due to repairs to the electrical installations in the Saint-Quentin-en-Yvelines sector, after weather conditions damaged the network.

• Saturday, July 11, 2026 - Line N : service disrupted between Versailles-Chantiers and Rambouillet from 6:30 PM.
  • Last train departing from Versailles-Chantiers : 7:31 PM.
  • Last train departing from Rambouillet : 7:10 PM.
    
    
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• Sunday, July 12, 2026 - Line N : service to resume from around noon.
  • First train departing from Rambouillet : 1:25 PM.
  • First train departing from Versailles-Chantiers : 1:30 PM.

Another point to note about the Line N: service will also be disrupted between Plaisir-Grignon and Mantes-la-Jolie on July 11 and 12. Again, replacement buses are planned to help passengers continue their journeys. To check the options offered at each station, the simplest approach is to consult the official works calendar for Lines N and U before you head out.

• Saturday, July 11, 2026 - Line N: disruption between Plaisir-Grignon and Mantes-la-Jolie.
• Sunday, July 12, 2026 - Line N: disruption remains in place on that stretch.
• Proposed solution: replacement bus service.

These disruptions aren’t ending with this weekend. On Tuesday, July 14, 2026, from 11:00 p.m., traffic will be suspended on the U line in the direction of La Verrière to La Défense. On the Transilien Line N, further interruptions are also planned after the weekend of July 11–12. From Monday, July 13 to Tuesday, July 14, 2026, the Line N will be interrupted between Épône-Mézières and Mantes-la-Jolie due to railway works. If you had planned to take the train for the Bastille Day fireworks, you’ll need to rearrange your plans.

As is often the case with major summer works, it’s wise to build in a comfortable buffer, especially if you have a connection at Versailles-Chantiers, Saint-Quentin-en-Yvelines, La Défense or Rambouillet. Before you head out, we recommend verifying your route on the official sites Transilien, on SNCF Connect or via Île-de-France Mobilités. Replacement bus timetables and routes may evolve as the work progresses.

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