The VBZ owns 313 tram vehicles, which between them cover over 16 million vehicle-kilometres per year. Of these, 88 are modern low-floor Bombardier Cobra trams delivered between 2001 and 2010. All the remaining trams in regular passenger service are of the Tram 2000 design, of which 201 vehicles were delivered between 1976 and 1992. Whilst the Tram 2000 is a high-floor design, 23 trams have been rebuilt with the addition of a low-floor centre section. Unlike the five-section Cobras, which normally only operate singly, the Tram 2000 vehicles are composed of one, two, or (in the case of rebuilt units) three sections, and in most cases operate in multiple.