The conventional wheeled Vienna tram with enclosed bogies and DC electric traction drive.
It's always good to see British inventions in foreign lands and hats off to Christopher Cockerill the inventor of the hovercraft: The latest Vienna tram known as the ULF permits a flat and very low curb height floor and easy boarding for push chairs and prams by using the hovercraft principles.
The ULF (Unter- Luft- Fahrt) tram relies on a directional cushion of high pressure air for traction and levitation provided by vertically mounted air compressors.