Overview of the Malfunction
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Date of malfunction: Investigation and announcement on June 25
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Cause (under investigation):
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The auxiliary power unit on the E8 series train failed.
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As a result, power supply to the main converter was cut, causing the cooling system to shut down.
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Circuit protection activated, making the motor inoperable and rendering the train unable to run.
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Damage to semiconductor components was confirmed in 1 out of 6 auxiliary power units.
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The cause of the damage has not yet been identified.
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Service Plan (as of June 25, 2025)
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"Tsubasa" trains running through to Tokyo:
Only one round-trip between Tokyo and Shinjo is operating:-
No. 121: Departs Tokyo at 6:12 → Arrives at Shinjo at 9:55
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No. 156: Departs Shinjo at 17:12 → Arrives at Tokyo at 20:48
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Other trains:
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Operations between Tokyo and Fukushima are suspended, and direct services are canceled.
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In general, "Tsubasa" trains operate only north of Fukushima.
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Some trains are fully suspended, while others only run between Yamagata and Shinjo, depending on the day.
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Future Plans
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From June 26 to 30, the same operation plan will continue. However, suspended trains and operating sections may vary daily.
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Service plans from July 1 onward are scheduled to be announced around June 27.
