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Series 681 EMU was made in order to shorten the arrival time by improvement of maximum and curving speed. To the vehicle, it is installed anti-rolling device. By the device, body slants toward an appearance with curve, and riding comfort prevents an erode thing. But a sound occurred, and spherical bearing of anti-rolling device had given an unpleasant feeling of to a passenger. Origin of sound is because bearing liner was worn away, and there was not a lubrication function. Possibility to control occurrence of noise came out afterwards as a result of having tried a strange sound occurrence preventive measure from spherical bearing.