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This report describes the electrical performance characteristics of the signle-sided linear induction motor (SLIIM), based on data acquired while propelling a MAGLEV test vehicle (HSST-01) over the speed range up to 300 km/hr. The experimental results of the LIM electrical characteristics are compared with those calculated by the analysis using the magnetic field equations. Further, we introduce the field current control by slip speeds adopted while the engine-alternator system is being used for the power supply to the LIM. We have been successful in accelerating the vehicle smoothly and in alleviating the influence of the normal force, especially the undesirable attractive force, by this control.