Overview
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Time of Incident: Around 2:10 p.m.
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Section: Between Ōmiya and Oyama Stations
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Event: Emergency brake activated, train came to a stop
Emergency Measures
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After onboard inspection by the crew, the train was confirmed to be operable.
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3:55 p.m. – Slow-speed operation resumed toward Oyama Station
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5:22 p.m. – Arrived at Oyama Station
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Subsequent Operations: Service suspended between Oyama and Morioka; approximately 560 passengers transferred to following trains
Preliminary Cause Analysis
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Faulty Component: Car No. 10 – “Coupling/Decoupling Switching Device”
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Condition: The device, which should have been set to “Decoupled” mode, had switched to “Coupled” mode
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This switch triggered the emergency braking system
Current Investigation Status
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The reason why the device switched to “Coupled” mode remains unknown
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Detailed investigation is ongoing
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The train was moved to the Oyama Shinkansen Rolling Stock Center the same night for further analysis
