Recently, the maximum speed of commercial Shinkansen trains of JR group reaches 270km/h, 275km/h or 300km/h. Under these high-speed circumstances, pantographs and overhead-line-equipment are seriously influenced by aerodynamic flow especially in tunnel. In these years, probably because of this high-speed or introduction of low noise pantograph, some minor troubles have been seen on the overhead catenary equip- ment in tunnel.
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