The system entered service in December 2000, but was closed from March 2001 through March 2002 while Bombardier performed upgrades to the vehicles. The vehicles follow a guidance rail on about 60% of the route. The Nancy GLT system is operated by the "Société de Transports de l'Agglomération Nancienne", or STAN. In Caen, where the central guidance rail has been installed on all sections of the passenger-service route, they follow the model used by trams, collecting their power from a single pantograph and returning it through the central guidance rail, and use their diesel motors and steering wheels only while travelling to and from the depot. Nancy’s fleet use dual trolley poles to collect and return their electric power, in order to allow the use of existing wires constructed for use by trolleybuses. They have 100% low floors, seat forty passengers, and have standing room for as many as 105. Unlike trams and Translohr vehicles, GLT vehicles have a steering wheel, though it is not used when following a guidance rail. They are designed to look much like trams, although they are unidirectional and have bus-like rear-view mirrors. With two articulation points and a total length of 24.5 metres, GLT vehicles are shorter than most modern trams, but quite long compared to regular buses. The wheels of rubber-tyred metros, on the other hand, are bound and guided by their rails in the same way as are steel-wheeled trains. GLT and the similar Translohr are often described as the tram equivalent of rubber-tyred metro technology, but this is not strictly accurate while the GLT follows a central rail, the rail does not support the vehicle, and the actual wheels which are as independent as those of a regular bus. GLT is the only model of bus produced by Bombardier’s transport division, which is otherwise focused on rail transport. Though both of the systems in these cities are referred to as ‘ tramways on tyres’, the GLT is in fact a model of guided dual-mode trolleybus, capable of following a central guidance rail and then driving independently like a conventional bus. Transport sur Voie Réservée or TVR) is a public transport system manufactured by Bombardier Transportation and used in the French cities of Nancy and Caen.
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