Last month, there was a power outage on the Tohoku, Hokuriku, and Joetsu Shinkansen lines. Operations were suspended for a long time.
JR East said that the problem was due to a flaw in the inspection manual for parts related to overhead wires. The inspection method was incorrect, resulting in an error being overlooked, JR said.. JR said, ``We deeply apologize for the great inconvenience caused to many customers. We are working to prevent it from happening again.''