From the early morning, an adhesion problem between wheels and rails, caused by the accumulation of dead leaves, complicated train braking in the Jouy-en-Josas area. This natural phenomenon, called 'enrayage', necessitated a reduction in train speed to ensure safety, leading to delays that progressively spread across the entire line. The end of these disruptions was announced at 8:57 AM.
During the day, a second incident affected the railway signaling equipment, also on track 2 in the Jouy-en-Josas sector. This malfunction imposed a speed reduction, slowing down train progress. Technical teams were mobilized to identify the source of the problem and restore normal operating conditions.
In the late afternoon, at 6:12 PM, the consequences of the signaling problem extended to level crossings 63 and 64, located in Vauboyen. These installations showed operational anomalies, requiring specific safety measures that further slowed down traffic. These constraints, occurring during the evening rush hour, led to several train cancellations between Massy-Palaiseau and Versailles-Chantiers, with delays reaching 37 minutes. Level crossing 63 returned to normal operation at 6:40 PM, but investigations into the initial signaling malfunction are ongoing.
