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.
The plan for the extension to Hangzhou was first approved by the central government in February 2006, with a planned date of completion in 2010. Work was suspended in 2008, owing to public protests over radiation fears  despite an environmental assessment by the Shanghai Academy of Environmental Sciences saying the line was safe and would not affect air and water quality, and noise pollution could be controlled.  According to China Daily, as reported on People's Daily Online 27 February 2009, the Shanghai municipal government was considering building the maglev line underground to allay the public's fear of electromagnetic pollution and the final decision on the maglev line had to be approved by the National Development and Reform commission.