In the case of the maglev (magnetic levitation), the large mangents is used in the train's drive section, and the track has large electromagnets along the trackway. When the electromagnets in the train are energized, and the ones in the trackway below the train are energized, and this both lifts and propels (and stops) the train.
The magnets in the trackway are energized along the path of the train so no energy is being used in the trackway electromagnets except the ones right below and directly in front of the train.
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