Amsterdam In June 2004, the first Amsterdam Combinos passed the mileage threshold of and were taken out of service. Earlier, Siemens technicians had identified stress fractures in the door segments of two of Amsterdam's oldest cars. But, according to Siemens, those turned out not to be dangerous, which is why the cars continued to be used. At the end of April 2004, it was decided not to call upon the twelve undelivered cars which were outstanding at that time. Kaohsiung Demonstrator A D-class Melbourne tram was borrowed by Siemens for a demonstrator in Kaohsiung for a three-month period in 2003-2004. The city did not follow through with purchasing the cars or building a line after the trial. In 2013 the city began construction of the Circular LRT line, which utilises CAF Urbos vehicles. Poznań Poznań announced in 2002 a tender for low-floor trams. Siemens won the contract with Combino. Poznań ordered 14 trams, each consisting of five modules, three double doors and three bogies, identical to the Amsterdam version. The first Combino entered service at the end of 2003. Due to flaws in construction, not all trams were in active service. An agreement between Poznań and Siemens provided that the city would pay the fraction (31%) of trams' cost only after the refit of all 14 Combinos. Combinos were usually used on the Poznański Szybki Tramwaj (Poznań Fast Tram) (light rail), that is on lines 14, 15 and 16 until they got replaced by Solaris Tramino trams. Starting from then Combinos are used on different lines to provide access to low-floor trams in other parts of Poznań. Siemens Combino Supra The current Combino model (Combino MkI) will no longer be produced. For the cities which have already ordered Combinos, such as Budapest (Hungary) and Almada (Portugal), Siemens will provide trams based on an older ADtranz design , under the new name Combino Supra. The new Combinos will have thin stainless steel rather than aluminium carbodies. Siemens now also wants to sell the Viennese Ultra Low Floor (ULF), another 100%-low-floor model, to other cities. The first two Combino Supras were delivered March 14, 2006 to Budapest. After serious initial teething problems, which involved door mechanism malfunctions that led to a recall of all Budapest Combino trams by Siemens, the trams were in regular service during 2006. After they had been repaired, Budapest's government decided that they would return them to Siemens.