Powerful refrigeration units provide the cooling. Maintaining low coil temperature is critical. Warming of only one or two degrees results in coil burn-out and levitation collapse. Barriers prevent passengers from getting too close, but they may still be exposed to as much as 200 Gauss. In comparison, people with cardiac pacemakers are in danger if exposed above 10 Gauss, computers should not get over 50 Gauss, and a California school was closed when EMR of less than 5 Gauss was detected.
Batteries are heavy, have limited capacity, and they are also dangerous.
Many U-boats have perished because of battery accidents. But wheels are in trouble themselves at high speed. Wheel troubles have already caused melt-downs of EDS test vehicles. If it should happen with passengers on board, there is virtually no chance of survival. After several conversions, a moving field of electric power is fed, in sections, into rows of overlapping coils located in the walls on each side of the U-shaped guideway, which propel and levitate the vehicles.