They float above the rails and are propelled by magnetism
Must be totally smooth, quiet and have great acceleration.
On a trial  did 1000 KM/h


Quote:

.........  At 460 kph, the 30-kilometre journey between Shanghai's Pudong airport and Longyang Road station takes only about seven and a half minutes.       ........

https://www.abc.net.au/news/2024-04-12/china-ultra-high-speed-trains-maglev-how-fast/103644930

https://live-production.wcms.abc-cdn.net.au/7a62fff3ea08f7596396585e5c22aa1a?impolicy=wcms_crop_resize&cropH=1667&cropW=2500&xPos=0&yPos=0&width=862&height=575

Some kids scamper near a track to put a big magnet 🧲 near it to demagnetise the spot. Then they scurry away.