The new TZen 4 electric bus line, connecting Viry-Chatillon to Corbeil-Essonnes in Essonne, has come to a complete halt this Tuesday. Just one week after its grand debut on February 10, 2026—culminating twenty years of anticipation—not a single vehicle has left the depot. A strike initiated by Force Ouvrière union activists has blocked the Corbeil-Essonnes bus depot since midnight, effectively stopping all service on the line.
This is a major setback for the regulars of this highly anticipated route. Around 47,000 daily travelers were expected to utilize the service, which was designed to ease congestion on Line 402, notorious for being the busiest line in Greater Paris. When contacted, Île-de-France Mobilités confirmed that “the TZen 4 is indeed halted” and that “the buses are not running.” For local residents, who had been counting on this new service to improve their daily commutes, the disappointment matches their high expectations.
The striking workers are protesting against several measures they find completely unacceptable. According to Baha Boudhaouia, FO union delegate at Tisse, the company operating the TZen 4, recent agreements signed by other unions with management have approved the elimination of various benefits, reports Le Parisien. Key issues include the elimination of holiday bonuses, the transition to a biweekly work schedule, and a cut in Sunday shift premiums. Union representatives also highlight instances of unjustified dismissals within the company.
At this stage, there’s no information yet on how long the strike will last. Tensions remain high between Tisse management and representatives of Force Ouvrière. It’s unclear whether negotiations are underway to resolve the deadlock. In the meantime, travelers are advised to turn to other bus routes in the area, especially line 402, which is likely to become even more crowded than usual.
As a reminder, the TZen 4 is a high-capacity electric bus line that serves several communities in Essonne, running between Viry-Chatillon and Corbeil-Essonnes. Set to launch on February 10, 2026, after twenty years of planning, this project represents a significant investment aimed at enhancing public transportation in southern Île-de-France. Its route follows dedicated lanes, designed to ensure more reliable service compared to traditional bus lines.
In short, this strike comes at the worst possible time for a line that hasn't even had a chance to settle into its rhythm. We recommend keeping an eye on real-time updates on the Île-de-France Mobilités website to stay informed about the situation and adjust your travel plans accordingly.
