I'm sure we all look back to our childhood's and recall having or seeing a toy train set (some of us have one as adults too!)
Check this video out below. This is a toy mag-lev train that runs liquid nitrogen..!
(jump to 4:00 of the video to see an interesting take on the concept!)
...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.Apparently the technology isn't new; the video was done a few years ago as a demonstration for the Leibniz Institute for Solid State and Materials Research in Dresden, Germany.