page_title: Bombardier Guided Light Transit
section_title: Characteristics
hierarchical_section_title: Bombardier Guided Light Transit / Characteristics
caption_attribution_description: English: A rail of the pneus tramway at Caen, France Deutsch: Eine Schiene der Busbahn in Caen (Frankreich) Français&#160;: La voie du Tramway sur pneus de Caen
context_page_description: Guided Light Transit is the name of guided bus technology and associated infrastructure designed and manufactured by Bombardier Transportation. It has been installed in two French cities: Nancy and Caen. As of 2018, only the Nancy system is in operation; the Caen system has been abandoned and now rebuilt as a conventional tramway by 2019.
  Both of the systems in these cities are referred to as "tramways on tyres", and in common with tram systems they use a surface guidance system and in normal operation are powered by electricity drawn from an overhead wire. However, while the vehicles are guided by a central guidance rail, they ride on rubber tyres, not on rails. There has been disagreement about whether they should be called "trams", for that reason and also because they are capable of being steered and operating independently of the guidance rail, using auxiliary diesel engines. GLT is effectively a model of guided dual-mode bus, but when GLT vehicles use a pantograph to collect current, as do those in Caen, they are not commonly considered to be trolleybuses.
context_section_description: 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. 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. Unlike trams and Translohr vehicles, GLT vehicles have a steering wheel, though it is not used when following a guidance rail. On the GLT line in Nancy, more than one-third of the 10-km route has no guide rail, and steering is controlled entirely by the driver on those sections. The Nancy GLT system is operated by the Société de Transports de l'Agglomération Nancienne, or STAN.
  With two articulation points and a total length of 24.5 metres (80 ft 5 in), GLT vehicles are shorter than most modern trams, but long compared with conventional buses. They are designed to look like trams, but they are unidirectional and have bus-like rear-view mirrors.
  They have 100% low floors, have 40 seats, and have standing room for as many as 105 passengers.
  In Caen, where the central guidance rail has been installed on all sections of the passenger-service route, the vehicles collect their power from a pantograph, returning it through the central guidance rail, and use their diesel engines and steering wheels only while travelling to and from the depot. Use of a pantograph effectively requires that a surface guidance system be used, to ensure the vehicle remains approximately centred below the overhead wire, so that its pantograph does not slip out from underneath the wire. The Caen vehicles thus cannot move laterally away from the overhead wire except when running in diesel mode (as conventional buses), and for this reason the Caen route is not commonly considered to be a trolleybus system.
  Nancy's fleet of 25 GLT vehicles use dual trolley poles to collect and return their electric power, in order to allow the use of existing wires constructed for use by the town's previous generation of trolleybuses and to permit operation, where desired by the transport authority, away from the guide rail. The Nancy vehicles follow a guidance rail on about 60% of the route, and thus the Nancy route uniquely is considered to be both a rubber-tyred tramway and a trolleybus line. The system was first brought into use for passenger service in February 2001, but operation was suspended from March 2001 through March 2002 while Bombardier performed upgrades to the vehicles.
  In Caen, the GLT fleet began operation in November 2002, incorporating the changes made to Nancy's vehicles during the upgrade. They were operated by the Compagnie des Transports de l'Agglomération Caennaise under the name Twisto until 2017, when the system was shut down and replaced by a conventional tram system.
caption: A central rail embedded in the road guides GLT vehicles while they are in their "tram-like" mode.
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