I wonder if it has something to do with surface exposure to magnetic fields. A very strong magnetic field, enough to levitate a train, zipping by you at the speed of said train, while not harmful to human biology unlike a lot of fear mongerers claim, can interfere with radio antennas and the navigation systems on ships and aircraft. The inside of the train is heavily shielded but I imagine it’s pretty much impossible to prevent it from escaping into the outside without containing the entire track in shielding.
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