An alternate current generator provides an oscillating current at a specified frequency, flowing into a conductive coil which is shaped such mirroring the train wheel. The coil is positioned as close to the wheel as possible and the varying magnetic field in its cross-section produces an electric field in the metallic material of the wheel.
An alternate current generator provides an oscillating current at a specified frequency, flowing into a conductive coil which is shaped such mirroring the train wheel. The coil is positioned as close to the wheel as possible and the varying magnetic field in its cross-section produces an electric field in the metallic material of the wheel.