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.
State and local leaders have also made it clear they’re fighting the decision and will continue to fight climate change, with or without federal support. The Climate Mayors Agreement is a commitment between now 8o+ cities including Austin, Palo Alto and San Francisco to ignore Trump’s March executive order that weakened the Clean Power Plan , which would have compelled states to set power plant emissions reductions goals. They want to keep those goals intact. Several of these same cities have jointly signed onto former Mayor Bloomberg’s new plan, which is a coalition of cities, states, and companies who plan on coordinating with the UN directly to come up with carbon emissions targets.