Abstract
The second mode of trainn car that causes "Jumping Derailment" was investigated to consider the mechanism of the derailment. A scale of 1 to 10 train model, either being stopped or being run, was vibrated by three types of frequency close to the second natural frequency. Acceleration, velocity, and displacement of the model were measured, and the behavior of the derailing model was video-taped by a high speed camera. Critical vibrating acceleration, critical lateral acceleration, and vibrating time span were evaluated. Obtained results showed that there was not so much difference in terms of acceleration, but the time span. By the video, it has been found that the reaction force acting on wheels was one of causes of the derailment.
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