http://www.core77.com/blog/technology/a_different_sort_of_mag-lev_as_demonstrated_with_toy_train_set_20674.asp

On Friday, we had a look at a levitating lamp by Ger Jansen, who develops and sells proprietary electromagnetics as Crealev. In the same vein, this video of a toy mag-lev train is not the conventional sort of magnetic levitation train, which uses electromagnets pulsing along a length of rail to compel the train into motion; this one is motorless and the magnetic field is formed using liquid nitrogen, a temperature differential, and a proprietary material that conducts an electric current at super-low temperatures.