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When a current of ∼300 A flows through a contact line that supplies power to a high-speed train traveling at maximum speed, it forms a strong magnetic field. Magnetometers-sensors that measure magnetic fields-are affected by this magnetic field around the contact line. In this study, the magnetic field formed around a contact line was measured and its effect on magnetometers was indicated. In order to confirm the degree of influence of such fields on a magnetometer, a magnetic field around adoi:10.1109/access.2020.3009948 fatcat:kim3xmq55vf4tcwproinazcaue