There are different systems. I couldn't answer about the Japanese system but I talked to Transrapid engineers, took a ride on the test track in Lathen/Emsland and then the Shanghai airport line. read more
The power us not delivered to maglev train it is delivered to tracks of the train .The trains tracks are installed with electro magnets which is powers by high voltage electricity the train dies not require the power they are fitted with permanent magnets or super cool semiconductors only for interior lightning purposes they has lithium ion batteries. read more
Germany and Japan are both developing maglev train technology, and both are currently testing prototypes of their trains. (The German company "Transrapid International" also has a train in commercial use -- more about that in the next section.) Although based on similar concepts, the German and Japanese trains have distinct differences. read more