JR East Discovers Auxiliary Power Unit Malfunction in E8 Series Train

JR East Discovers Auxiliary Power Unit Malfunction in E8 Series Train

JR East has revealed the investigation progress and immediate response regarding the E8 series train malfunctions.

On June 17, railway malfunctions occurred involving a non-operational train between Utsunomiya and Nasushiobara Stations on the Tohoku Shinkansen, the “Tsubasa 136” at Oyama Station, a non-operational train at Koriyama Station, and the “Tsubasa 139” between Fukushima and Sasakino Stations on the Yamagata Shinkansen. All four were E8 series, and damage to semiconductor components inside the auxiliary power unit was confirmed. Additionally, a malfunction in the auxiliary power unit was newly discovered in one E8 series train at the rail yard. The cause of the damage has not been identified.

As a result, the operation of the E8 series alone has been suspended, and except for a few direct trains, the Yamagata Shinkansen operates turn-around services between Fukushima and Yamagata/Shinjo Stations. From July 19, the number of direct trains to the Tohoku Shinkansen will be increased from the current one round trip to three. Consequently, the number of Yamagata Shinkansen services is expected to decrease. The operation plan from July 15 will be announced on July 11. This response will be implemented throughout July.

Additionally, to increase seating capacity on the Tohoku Shinkansen, E8 series trains currently stationed within the Yamagata Shinkansen will be sequentially transferred to the Tohoku Shinkansen during the nighttime, increasing trains operating with 17 cars on the Tohoku Shinkansen.

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