By electromagnetic levitation system (EMS) today, trains to float above the rails, while the electromagnetic attached to the car to rest along the railway from below. Systems are usually arranged in rows on the arm C, with the upper part of the arm is attached to the vehicle, and the bottom edge of the magnet. Trains to float between the upper and lower bound. Of electromagnetism is inversely proportional to the distance cubed, so little change in the distance between the magnet and the raceway will produce a dramatic change. Changes of these forces is unpredictable dynamic - if there is a little different from the ideal position, trends, it makes it worse, much more, and a complex system of control feedback is required. used to keep a distance from the body of the car to a constant (about 15 mm (0.59 in.))
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