山形新幹線、一部運休続く　「Ｅ８系」不具合、４編成で―ＪＲ東

　東北新幹線の下り回送列車（Ｅ８系）が１７日、車両故障で走行不能となったトラブルについて、ＪＲ東日本は１８日、別のＥ８系３編成でも同様の不具合が起きたと明らかにした。原因が判明するまでＥ８系の単独運転を取りやめ、山形新幹線は一部運休が続く。
　１７日のトラブルは宇都宮―那須塩原間で発生。営業列車として投入される前に行う確認走行中だった回送列車が加速できなくなり、東北新幹線は東京―仙台間の上下線で約５時間半にわたり運転を見合わせた。
　ＪＲ東によると、車両の各機器に必要な電力を供給する装置に不具合が起き、モーターが動かなくなったという。運転見合わせの間、駅に停車するなどしていた別の回送列車１編成と営業列車２編成でも同じ不具合が発生した。（2025/06/18-21:51）

East Japan Railway Co., or JR East, said Wednesday that it will suspend some services on the Tohoku and Yamagata Shinkansen train lines, following malfunctions found on E8 series Shinkansen trains.
   The railway operator said that it will halt individual operations of E8 trains until the cause of the trouble is identified.
   On Tuesday, an out-of-service E8 train became unable to accelerate while traveling northward between Utsunomiya and Nasushiobara stations in Tochigi Prefecture, leading to a service suspension between Tokyo Station and Sendai Station in Miyagi Prefecture for about five and a half hours.
   JR East said that a power supply device malfunctioned, causing the motor to stop working. The company added that three more E8 trains--two in service and one out of service--suffered issues during the service suspension.
   The E8 series entered service last March. Nine trains are in operation, while two are undergoing test runs. The four trains that malfunctioned were the latest version, delivered in November last year and after.