[Summer 2023 works] Traffic suspended between Cergy–Le Haut and Conflans–Fin d’Oise stations from 5 to 20 August and between Nation and Val de Fontenay/Fontenay-sous-Bois stations from 9 to 18 August #2

As announced in the previous bulletin regarding works over the summer, traffic will be disrupted all day between 5 and 20 August 2023. To ensure that you have all the relevant information on hand to prepare your journey, I would like to share the alternative routes that will be set up during the period. 

This year, the replacement bus service will leave from various stations, depending on your destination. This is a necessary measure to optimize travel time with direct and semi-direct buses, and to improve traffic management. Buses are color-coded to help you easily identify the route to take: Yellow, Pink and Blue for westbound buses; and Brown and Green for eastbound buses. 

Between Cergy–Le Haut and Conflans–Fin d’Oise stations: 

RER line A will be closed all day between Conflans–Fin d’Oise and Cergy–Le Haut stations from 5 to 20 August 2023 for track and ballast refurbishment works. 

Our tips:

• To reach the following stations from Paris:
  • Neuville–Université and Cergy–Saint-Christophe: Take RER line A to Conflans–Fin d’Oise station, then take the Yellow bus (semi-direct) towards Cergy–Saint-Christophe stop.
  • Cergy–Préfecture: Take RER line A to Achères–Ville station, then take the Pink bus (direct) towards Cergy–Préfecture stop.
  • Cergy–Le Haut: Take RER line A to Poissy station, then take the Blue bus (direct) towards Cergy–Le Haut stop.

 Please be informed that frequency will be increased on the usual bus routes 45 and 49.

 Over the same period, regional train line L will be suspended between Cergy–Le Haut and Maisons-Laffitte station for works. Find more information on the line L blog.

Between Nation and Val de Fontenay/Fontenay-sous-Bois​ stations:

RER line A will be closed all day between Nation and Val de Fontenay/Fontenay-sous-Bois stations from 9 to 18 August 2023 for track equipment renewal.

Our tips:

Marne-la-Vallée–Chessy branch:

From the stations on the Marne-la-Vallée–Chessy branch, take RER line A to Val de Fontenay station. Then to go to:

• Vincennes: take the Brown bus or bus route 118 at Val de Fontenay stop to Château de Vincennes stop.

• Nation: take the Brown bus or bus route 118 at Val de Fontenay stop to Château de Vincennes stop, then take metro line 1 to Nation station.

• Gare de Lyon and Châtelet–Les Halles stations: take regional train line E at Val de Fontenay station to Magenta station, then take RER line B or D.

• Auber station and beyond: take regional train line E at Val de Fontenay station to Haussmann Saint-Lazare station, then take RER line A.

 Regional train line E will be closed every evening between Haussmann Saint-Lazare and Tournan stations from 5 to 20 August 2023 from 10:30 p.m. onwards. You will find more information on the line E blog. From 10:30 p.m. onwards, passengers must therefore take the Brown bus or bus route 118 at Val de Fontenay stop to Château de Vincennes stop, then take metro line 1 to Nation station, where they can take RER line A again.

Boissy-Saint-Léger branch:

From Fontenay-sous-Bois station to reach the following stations:

• Vincennes: take the Green bus or bus route 210 to Château de Vincennes stop.

From Nogent-sur-Marne station to reach the following stations:

• Vincennes: take bus route 114 to Château de Vincennes stop.

From Joinville-le-Pont station to reach the following stations:

• Vincennes: take RER line A to Fontenay-sous-Bois station, then take the Green bus or bus route 210 to Château de Vincennes stop.
• Nation: take RER line A to Fontenay-sous-Bois station, then take the Green bus or bus route 210 to Château de Vincennes stop, then take metro line 1 to Nation station.

From Saint-Maur–Créteil, Le Parc de Saint-Maur, Champigny and La Varenne–Chennevières stations to reach the following stations:

• Vincennes: take RER line A to Fontenay-sous-Bois station, then take the Green bus or bus route 210 to Château de Vincennes stop.
• Nation: take RER line A to Fontenay-sous-Bois station, then take the Green bus or bus route 210 to Château de Vincennes stop, then take metro line 1 to Nation station.
• Gare de Lyon and beyond: take the TVM bus route at Saint-Maur-Créteil station, then metro line 8 at Créteil–Université station to reach Paris.

From Sucy–Bonneuil and Boissy-Saint-Léger stations to reach the following stations:

• Vincennes: take RER line A to Fontenay-sous-Bois station, then take the Green bus or bus route 210 to Château de Vincennes stop.
• Nation: take RER line A to Fontenay-sous-Bois station, then take the Green bus or bus route 210 to Château de Vincennes stop, then take metro line 1 to Nation station.
• Gare de Lyon and beyond: take bus route 393 at Sucy–Bonneuil stop, then take metro line 8 at Créteil Pointe du Lac station to reach Paris.

 Please note that travel time will take longer. Please note that, at the end of service, the last train leaving from Nation station will not allow you take the last connecting train from Val de Fontenay or Fontenay-sous-Bois stations, and vice versa.

As you might have noticed, the impact of these major works will be significant. However, they are necessary in order to keep infrastructures in optimal condition. We are setting up as many alternative services as we can, with substitute bus routes, and more frequent bus and metro services. We encourage you to modify and plan your journeys, and when possible, postpone journeys on the affected lines.

Will I be affected by these closures?

To help you determine whether these works will affect your journeys, we will soon provide a simplified RER line A station-to-station itinerary simulator. You will then be given the best alternative itinerary for your journeys during the period.

By using this simulator, you will be able to better plan for your journey.

If you have any questions regarding these alternative routes,  please leave your questions in the comment section.