JR East has revealed the investigation progress and temporary measures regarding four train malfunctions that occurred on the Tohoku Shinkansen on June 17.
On the same day, train malfunctions occurred with a transfer train between Utsunomiya and Nasushiobara stations on the Tohoku Shinkansen, the Tsubasa 136 at Oyama Station, a transfer train at Koriyama Station, and the Tsubasa 139 between Fukushima and Sasakino stations on the Yamagata Shinkansen.
All four train sets were E8 series, and damage to semiconductor elements in the same parts of the auxiliary power units was confirmed. The cause of the damage has not been identified yet.
Due to the suspension of independent E8 series operations, the Yamagata Shinkansen is conducting turn-back operations between Fukushima and Yamagata/Shinjo stations, excluding some direct trains. As a result, the number of trains is approximately 80% of the usual schedule.
Until the cause is identified, this measure will continue to be implemented.
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