Key Facts
• June 17: E8 series train stopped due to power unit failure.
• Same day: Three other E8 series trains experienced similar issues.
• Investigation revealed semiconductor damage in the power unit.
• Cause of damage remains unknown; temperature effects under investigation.
• June 27–30: Over 30 train cancellations across full or partial routes.
• Most partial cancellations occur between Yamagata and Fukushima.
• Direct service between Shinjo and Tokyo limited to one train each way.
• July operation plans to be announced around June 27.
• Passengers advised to check JR East’s website for updates.
Summary
The Yamagata Shinkansen’s E8 series trains faced power unit failures on June 17, halting operations. Investigations by JR East identified semiconductor damage in the power units, though the exact cause remains unclear. As a result, over 30 train cancellations are scheduled from June 27 to 30, affecting full and partial routes, primarily between Yamagata and Fukushima. Direct services between Shinjo and Tokyo are limited to one train each way. JR East plans to announce July schedules around June 27 and urges passengers to check their website for updates.
