A future application is the Maglev train, now under development in Japan. To minimize friction, powerful onboard superconducting magnets support this train above the tracks. The prototype train shown in the photo reached a speed of 411 km/hr (256 mi/hr).

Running alongside the track are walls (see photo) with a continuous series of vertical coils of wire mounted inside. The wire in these coils is not a superconductor. As the train passes each coil, the motion of the superconducting magnet on the train induces a current in these coils, making them electromagnets. The electromagnets on the train and outside produce forces that levitate the train and keep it centered above the track. In addition, a wave of electric current sweeps down these outside coils and propels the train forward (see drawings).

Drawings of Maglev train showing magnets both on-board and built into sidewalls; drawings courtesy of Railway Technical Research Institute Maglev Systems Development Department

Japanese Maglev prototype MLU0002N with aerodynamic brakes deployed; photo courtesy of Railway Technical Research Institute Maglev Systems Development Department.