Stream involves a track in the street flush with the surface. It contains the electrical power to propel the wheel hub motors on the bus. The power in the track is not activated unless the bus is over it. An extremely powerful permanent magnetic device, which is located under the vehicle in such a configuration that it is always coordinated with the positive and negative shoes. The shores are in contact with the two sources of power in the underground ducting in the track and activated the electrical current at that point.
Battery power can move the bus when off-track operation is necessary.
Considerable flexibility of the buses is possible. It gives the bus trolley bus characteristics without overhead wire. When completed, the Stream will have a 3.3-kkm route from the center of Trieste. Operational testing of Phase One will be evaluated prior to the decision to extend the system to the full route plan of approximately 12-km. Setra, a part of Evobus, in Germany has announced TopClass 400, a completely new coach concept from the design and interior equipment to many technical innovations.