The Siemens Avenio is a low floor tram family produced by Siemens Mobility, a subsidiary of the German conglomerate Siemens. It is the successor to the Combino family. The first generation was sold as the Combino Supra , Combino MkII, or Combino Plus. With the introduction of the second generation in 2009 the Combino brand was dropped and Siemens have referred to Combino Plus trams in Almada (Portugal) and Budapest (Hungary) as part of the Avenio range. The Avenio is made of stainless steel instead of light materials, and is manufactured at a new assembly line in Vienna. Like the Combino it utilizes a modular design with standardised components, with resulting reduced costs. Differences between the Combino and the Combino Supra Unlike the Combino, the Combino Supra is designed in fixed sections. Each section has a bogie, either powered or unpowered. The length can be anywhere from two sections () to eight (). In Budapest and Almad, modules are in two-car blocks, each connected by a double articulation joint. In the Combino and other articulated low-floor trams, the modules are suspended between the bogies. Siemens claims the axle load is for a width of , such as the Almada. For Budapest, the length went from nine modules of the Combino to six for the Combino Supra. The Combino had a half-width door near the driver's cab, where the Combino Supra has a full double-leaf door. Combino Plus Budapest The city transport company of Budapest ordered 40 Combino Supra Budapest NF 12B units for the city's tram network. The six-module trams (three units of two sections) are 53.99 meters long, exceeded only by the 59.4 m CarGoTrams in Dresden, thus making them the longest passenger trams in the world at the time of their introduction. (In 2016 56 meters long CAF Urbos 3 trams entered service in Budapest.) The first two units were delivered on March 14, 2006, and the rest was delivered by the summer of 2007. In the summer of 2006 problems arose. On August 1, 2006 Budapest mayor Gábor Demszky ordered all six trams to be withdrawn from service until technical problems were cleared up. There were problems with the doors, caused by sensitive fail-safe systems that brought trams to a halt for reasons including luggage or the odd leg getting stuck in a door. Siemens AG reportedly admitted the door problem to be a "design fault". Another