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Measurements can only determine instantaneous magnetic fields of the traction power system because the current flow is constantly changing. Simulation programs are applied to reliably assess magnetic field densities of traction power systems. Measurements and calculations showed that in striking distance of a railway track maximal values of 100 µT can occur for a short time. 24 h maximal values are between 1 and 10 µT (Federal Office for Radiation Protection, Germany).