RER A train adjustments begin in late October

Starting from Tuesday, October 27, the first RER A train departing from Cergy–Le Haut will no longer run on the section up to Maisons-Laffitte from Tuesday to Saturday, with this change scheduled until Saturday, November 7, inclusive. This affects morning commutes in the direction from Cergy–Le Haut to Maisons-Laffitte, which serves several key stations in the area.

First train departure time changes

The first maintained departure from Cergy–Le Haut is scheduled at 5:11, with the NATO04 services during the week and OPPE20 on Saturday. The disruption period for the cancellation of the first train is between 4:30 and 5:10 on Tuesdays, Wednesdays, Thursdays, Fridays, and Saturdays until November 7. Sundays and Mondays are not affected by this schedule.

Evening train interruptions and work schedule

RER A trains are interrupted every evening from Monday to Friday starting at 9:50 PM between Maisons-Laffitte and Cergy–Le Haut. This phase runs until November 6, then resumes from November 16 to November 27. The disruptions are due to maintenance on the Cergy branch and the renewal of railway infrastructure in the Achères area.

Bus services replace disrupted train routes

To ensure the continuity of travel, the operator organizes replacement buses between Sartrouville and Cergy–Le Haut. Two services are planned: an omnibus line, which serves the affected stations, and a semi-direct link. Trains that cannot continue towards Cergy end their journey at Sartrouville.

Bus schedules and travel considerations

From Sartrouville to Cergy–Le Haut, the first buses of both services are scheduled to depart at 10:01 PM and the last at 1:26 AM, with a frequency of 30 minutes. In the opposite direction, the omnibus buses depart from Cergy–Le Haut from 10:05 PM to 12:05 AM; the semi-direct buses from 9:54 PM to 11:21 PM, also with a departure every 30 minutes. These times correspond to the schedule published for the evening work periods.

Future disruptions and travel updates

After the period ending on November 6, another interruption is announced from November 9 to November 13 starting at 10:00 PM between Nanterre–Préfecture and Cergy–Le Haut or Poissy. Replacement connections will then be organized from Nanterre–Université. Travelers on the Cergy branch will need to take into account this change in the starting point of the buses for their late-night returns. For specific journey details, travelers can check the updated schedules on the RER A traffic information or in their route planner before heading to the station.