"The Tzen 4, a fully electric bus rapid transit line operating largely on segregated lanes, entered service on 10 February 2026 in the southern Île-de-France region. After several years of infrastructure works (the start of commercial operations was expected in 2024 ...), the new corridor connects Viry-Châtillon to Corbeil-Essonnes, serving the municipalities of Grigny, Ris-Orangis and Évry-Courcouronnes along a 14-kilometre route."
"The line is operated with 30 bi-articulated electric buses measuring 24 metres in length, developed specifically for Île-de-France Mobilités by Swiss manufacturer Hess (that has taken over the contract from Van Hool following the bankruptcy of the latter). The vehicles, that were reported as ready for deployment in October 2025, are equipped with high-power batteries supplied by Kiepe Electric (whose trolleybus business has been recently taken over by Hess) and use Alstom's ground-based static charging system (SRS)."
The Tzen 4 BRT entered service on 10 February 2026 in southern Île-de-France, linking Viry-Châtillon to Corbeil-Essonnes along a 14-kilometre corridor and serving Grigny, Ris-Orangis and Évry-Courcouronnes. Île-de-France Mobilités expects the line to carry more than 50,000 passengers per day. The corridor was redesigned with the majority of alignment on dedicated lanes and includes 30 new stations in Essonne. Operations use 30 bi-articulated 24-metre electric buses built for Île-de-France Mobilités, equipped with high-power Kiepe batteries and Alstom ground-based static charging enabling full recharges at termini in under five minutes without overhead lines. Vehicles are low-floor, 140-passenger capacity, air-conditioned, accessible and fitted with USB ports, dynamic passenger information and video protection.
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