In electrodynamic suspension (EDS), both the guideway and the train exert a magnetic field, and the train is levitated by the repulsive and attractive force between these magnetic fields.  In some configurations, the train can be levitated only by repulsive force. In the early stages of maglev development at the Miyazaki test track, a purely repulsive system was used instead of the later repulsive and attractive EDS system.  The magnetic field is produced either by superconducting magnets (as in JR–Maglev) or by an array of permanent magnets (as in Inductrack ). The repulsive and attractive force in the track is created by an induced magnetic field in wires or other conducting strips in the track. A major advantage of EDS maglev systems is that they are dynamically stable – changes in distance between the track and the magnets creates strong forces to return the system to its original position.  In addition, the attractive force varies in the opposite manner, providing the same adjustment effects. No active feedback control is needed.
Unfortunate though it may be, a single uncouth act committed by a single unprofessional officer can impact the entire law enforcement profession. Rarely does the public make a distinction between uniforms; at the end of the day, all police officers look and act the same in the eyes of the average citizen. That's why it is so vitally important that each and every officer does her utmost best to maintain and build on the trust that the public has given her, instead of squandering it simply for the sake of bravado, greed or self-gratification.