To investigated an inadiquate track circuit shunting phenomena, authors sticked a bio-electric amplifire on the wheelsets of an expermental model truck. They operated the truck on an experimental model test track which was setup with a new conception so as to constantly keep the applied voltage on the experimental test track circuit. 0n the course of the experiment, they found that a strong electric resonance phenomena occured on the circuit which composed by the twin wheelsets of the test truck and the twin rails.