Trolleybuses in Nancy

The Nancy trolleybus system (French: Réseau de trolleybus de Nancy) is part of the public transport network of the city of Nancy, France, and the neighboring comunes (municipalities) of Essey-lès-Nancy, Saint-Max and Vandœuvre-lès-Nancy. The trolleybus system opened in September 1982, and by one year later it had grown to three fully trolleybus routes (3, 4, and 19). Three additional services were introduced that did not require any additional overhead trolley wires, as the fleet consisted of Renault dual-mode buses that could use the wiring of route 3 and then continue (as routes 23, 33, or 43) in diesel mode beyond the end of the wiring. Trolleybus service on route 3 ended in 1996, leaving only routes 4 and 19 in operation.

Trolleybus operation on the remaining routes was suspended in 1999 to permit the conversion of the system's most heavily used corridor into a guided bus route, still using trolleybuses but now with the Bombardier Guided Light Transit (GLT) system over the majority of a new route T1, which was formed by combining the southern part of routes 4 and 19 with the northern part of route 3 and would be marketed as the "tram" line. The Bombardier trolleybuses used the GLT guide rail on around two-thirds of the route, and operated without any surface guidance on a little more than one-third of the route. Passenger service on this 10-kilometre-long (6 mi) route from CHU Brabois to Essey-lès-Nancy began in January 2001. Technical problems related to the guide rail led to a one-year suspension of service soon after route T1 opened, along with much shorter suspensions later in 2002 and in 2003.

In 2017, with the Bombardier GLT trolleybuses within a few years of the end of their predicted lifespan, the metropolitan council decided to replace the "tram"-branded trolleybus line with a true tramway by 2022. However, in 2021, those plans were dropped, and an order was placed with Carrosserie Hess for new, conventional (unguided) trolleybuses to replace the GLT vehicles. The surface guidance system was removed in 2023–2024, with trolleybus service suspended from mid-March 2023 to permit that work and some revisions to the overhead wiring. The first of the new Hess trolleybuses was delivered in March 2024, and the trolleybus system reopened in April 2025.