Manufactured by Stadler Rail, Variobahn comprises 25.71% of the total number of trams operating in Tramz.
Since its introduction in 1993, the Variobahn has been manufactured variously by ABB, Adtranz, Bombardier Transportation, and since 2001 by Stadler Rail. Stadler subsequently renamed the tram as Variobahn and has since secured several contracts, delivering: 8 trams for use on the Ludwigshafen tramway 30 trams for the BochumGelsenkirchen tramway 8 trams for the Nuremberg tramway 14 trams for the Munich tramway 12 trams for the Bergen Light Rail 45 trams for the Graz tramway 19 trams for the Potsdam tramway 12 trams for Tramlink in London To Stadler Rail's standard, 100% low-floor, Variobahn design. In January 2011, Tramtrack Croydon invited tenders for the supply of ten new or second-hand trams, and on 18 August 2011, TfL announced that Stadler Rail had won a $19.75 million contract to supply six Variobahn trams similar to those used by Bybanen in Bergen, Norway. In August 2013, TfL ordered an additional four Variobahn trams for delivery in 2015, an order which was later increased to six. This brought the total Variobahn fleet up to ten in 2015, and twelve in 2016 when the final two trams were delivered. 
