A difficult morning occurred on Line V, particularly in the Jouy-en-Josas sector. From 6:25 AM, adhesion problems were reported, affecting a line train as well as a freight train.
At 8:34 AM, the freight train encountered difficulties moving forward and crossing an incline. Unable to fully clear the safety zone of the level crossing, it caused the barriers to remain lowered, preventing road traffic from resuming at the exit of Jouy-en-Josas. Barriers can only be raised once the train has completely cleared the protected area, a crucial safety measure for road users.
These incidents led to an interruption of traffic in the direction of Massy-Palaiseau > Versailles Chantiers, with a resumption initially planned for 10:30 AM. In the other direction, the station of Petit Jouy–Les Loges was not served until 10:00 AM.
Around 10:15 AM, trains resumed normal speed in both directions, although traffic remained disrupted across the entire line. The station of Petit Jouy–Les Loges remained unserved in the direction of Versailles Chantiers until 11:00 AM.
The reason for these disruptions is linked to the station's location in a sloping area. In autumn, the presence of dead leaves on the tracks reduces adhesion, making it more difficult for trains to restart after stopping at a station. Under these conditions, some trains may have trouble restarting or be unable to do so. Consequently, certain trains do not serve the station in the direction of Massy-Palaiseau > Versailles Chantiers.
Despite the return to normal speed, the consequences of the incident required adjustments to the transport plan. Some trains bound for Versailles Chantiers were canceled because the initially planned trains did not have the necessary capacity to guarantee a restart under the current adhesion conditions, which could have led to further disruptions.
