Last month, there was a problem that caused the Tohoku, Hokuriku, and Joetsu Shinkansen trains to suspend operation for a long time. JR East said that there was a flaw in the inspection manual for parts related to overhead wires, and that the inspection method was incorrect, resulting in an error being overlooked. I made it clear.
Last month, there was a power outage on the Tohoku, Hokuriku, and Joetsu Shinkansen lines, and operations were suspended for a long time.As a result of the problem, JR East said that the parts that adjust the tension on the overhead wires broke, causing the overhead wires to sag and causing train running to stop. It is believed that contact may have been the cause.
According to JR East, an outside research laboratory conducted an investigation and found that the part broke because the space between it and another part was too narrow and continued contact was made.
Originally, the distance between two parts is supposed to be measured during regular inspections to prevent them from coming into contact with each other, but because the instructions in the manual were vague, the person in charge made a mistake in the measurement point and overlooked the abnormality. That's it.
Furthermore, when JR investigated, there were nine locations on all Shinkansen lines where the spacing was narrower than specified in the manual, and approximately half of the people in charge of inspections had a wrong understanding of the measurement method. .
JR East said, ``We deeply apologize for the great inconvenience caused to many customers.We believe that the problem was due to a flaw in the manual, and that this is a management issue.'' We are working to prevent it from happening again.