Key Facts
• June 17: E8 series train malfunctioned on Tohoku Shinkansen between Utsunomiya and Nasushiobara.
• Total of 4 E8 series trains reported auxiliary power unit semiconductor damage.
• July 9: JR East announced ongoing investigations with no cause identified yet.
• Yamagata Shinkansen turnback operations at Fukushima Station to continue until at least July.
• E8 series single operations suspended across Shinkansen and conventional lines.
• July 19: Direct trains between Tohoku and Yamagata Shinkansen to increase from 1 to 3 round trips.
• Train frequency on Fukushima–Yamagata section expected to decrease due to limited available trains.
• E8 series trains stored in Yamagata Shinkansen to be moved to Tohoku Shinkansen for 17-car operations.
• July 15 operational plans to be announced on July 11.
• JR East apologizes for passenger inconvenience and promises further updates for August and beyond.
Summary
JR East continues to face challenges with its new E8 series trains on the Yamagata Shinkansen, following multiple malfunctions involving auxiliary power unit semiconductor damage. Investigations have yet to identify the root cause, prompting the continuation of turnback operations at Fukushima Station until at least July. Direct train services between the Tohoku and Yamagata Shinkansen will increase from one to three round trips starting July 19, though train frequency on the Fukushima–Yamagata section will decrease due to limited train availability. JR East is reallocating E8 series trains to the Tohoku Shinkansen for expanded 17-car operations. The company has apologized for the inconvenience caused to passengers and plans to provide further updates on operational adjustments for August and beyond.
