By 
Strategic Network Closures Across Paris
Transport across the capital and surrounding region is fragmented today, 4 October, due to a series of coordinated modernization works. The most significant impact is the total closure of Metro Line 6 between Charles de Gaulle–Étoile and Nation for the entire day.
This shutdown affects critical transit hubs and tourist zones, including Trocadéro, Bir-Hakeim, and Bercy. For those relying on this line, RATP has implemented limited replacement buses specifically between Charles de Gaulle–Étoile and La Motte-Picquet–Grenelle, while reinforcing bus route 71.
Travelers should note that the replacement bus does not mirror the full Line 6 route to Nation. Those heading to Montparnasse-Bienvenüe (interchange for lines 4, 12, and 13) or Bercy (interchange for line 14) must seek alternative Metro or bus connections. This closure is part of a broader autumn program, with further full-day shutdowns scheduled for 11 October, 18 October, 8 November, and 22 November.
RER C Operational Shifts and Timing Risks
The RER C network is operating under a tiered schedule today, making the 17:00 mark a critical pivot point for passengers.
Until 17:00, trains serving Dourdan and Saint-Martin-d’Étampes are restricted, operating only as far as Juvisy. Passengers traveling to or from central Paris must transfer to the RER D at Juvisy to complete their journey.
After 17:00, direct links resume between Paris and these southern branches, restoring service to key central stations including:
- Musée d’Orsay
- Saint-Michel Notre-Dame
- Paris Austerlitz
- Bibliothèque François Mitterrand
However, the Paris–Massy-Palaiseau corridor remains disrupted throughout the day. Stations between Bibliothèque François Mitterrand and Massy-Palaiseau are unserved, with a replacement bus operating between Pont de Rungis and Massy-Palaiseau.
High-Risk Interchanges: Massy-Palaiseau and Versailles
Massy-Palaiseau is currently a high-risk node for travelers due to its role as a multi-modal hub connecting RER B, RER C, T12, and TGV services. Because this station facilitates transfers to both Charles de Gaulle and Orly airports, the RER C disruptions create a ripple effect for international travelers.
Those heading specifically to Orly Airport are advised to use Metro 14, which remains a viable alternative to the disrupted RER C corridor (which affects Orly Ville and Pont de Rungis–Aéroport d’Orly). The Paris Region Airports ticket remains priced at €14 for eligible journeys.
Late-night travel is further complicated by the Transilien Line V schedule. Starting at 23:00 tonight, service between Versailles-Chantiers and Massy-Palaiseau will be interrupted, shifting all intermediate station traffic to replacement buses.
4 October Service Status Summary
| Time Window | Network | Status | Impact |
|---|---|---|---|
| All Day | Metro 6 | Closed (CDG–Étoile to Nation) | Use alternative Metro lines or bus 71 |
| Until 17:00 | RER C (Dourdan) | Limited to Dourdan $\leftrightarrow$ Juvisy | Transfer to RER D at Juvisy for Paris |
| Until 17:00 | RER C (St-Martin-d’Étampes) | Limited to St-Martin $\leftrightarrow$ Juvisy | Transfer to RER D at Juvisy for Paris |
| From 17:00 | RER C (Southern) | Direct Paris links resume | Standard service returns to central Paris |
| All Day | RER C (Paris–Massy) | Corridor interrupted | Intermediate stations inaccessible via rail |
| From 21:07 | RER C (Dourdan) | Evening closure begins | Last Dourdan departure at 21:07 |
| Late Evening | RER C (St-Martin-d’Étampes) | Evening closure begins | Last departure St-Martin 21:41; Austerlitz 22:45 |
| From 23:00 | Transilien V | Versailles-Chantiers $\leftrightarrow$ Massy closed | Switch to replacement buses |
Key Takeaways
- Metro Line 6 is offline all day; replacement buses are only partial.
- RER C southern branches require a transfer at Juvisy until 17:00.
- Massy-Palaiseau is a critical disruption point for TGV and airport transfers.
- Metro 14 is the recommended alternative for Orly Airport access.
- Versailles-Massy rail links cease at 23:00, moving to bus service.
FAQ
Which Metro lines can I use instead of Line 6? Depending on your destination, lines 4, 12, 13, and 14 provide the best alternatives for the major hubs normally served by Line 6.
How do I get to Orly Airport today? While the RER C corridor is disrupted, Metro 14 remains fully operational and is the most reliable route to Orly Airport.
What happens if I need to travel to Dourdan before 17:00? You must take the RER D to Juvisy and transfer to the RER C for the final leg of the journey.
