JR East Japan disclosed the investigation status and future measures regarding the train malfunction that occurred on the Tohoku Shinkansen on August 24.
The train malfunction occurred around 2:10 PM on the same day, when the “Yamabiko 63” (E5 series, 10-car train) was running between Omiya and Oyama stations. The emergency brake was activated, stopping the train. After confirming it could run on its own, it proceeded to Oyama Station at a reduced speed and arrived at 5:22 PM. The operation was then terminated, and approximately 560 passengers boarded a following train.
Upon examining the train at the Oyama Shinkansen Vehicle Center during the night, it was found that the device in the 10th car used to electrically switch between “separate” and “couple” was set to the “couple” position. The details are under investigation. No abnormalities were found in the propulsion or brake systems.
In the future, in preparation for similar malfunctions, new guidelines for temporary measures by crew members will be established to enable quick responses and ensure early resumption of operations.
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