Two different models of the TFS were produced, both being articulated designs. The first model, the TFS-1, was built for the opening of the Nantes tram system in 1985. As built, these were single-articulated 6-axle tramcars with a high floor and steep stepped access from low level boarding platforms. All the tramcars built in this form have since been rebuilt with an added low-floor centre section, thus becoming 8-axle double-articulated cars. Nantes subsequently bought additional TFS-1 trams in this 8-axle configuration.