 By the time a new series of high-floor vehicles was needed, DUEWAG had been sold to Siemens Transportation Systems and later dissolved, meaning that additional Type B cars were no longer being made.Siemens subsequently proposed the "", a high-floor derivative of its Combino series of low-floor city trams.In August 1999, after two months of testing, the first CitySprinter prototype crashed into another tram at at the "Christophstraße/MediaPark" U-Bahn station.