A maximum of 5-hour stops, such as wire slack and Yamanote Line It resumes in the afternoon.
It was found around 8:15 a.m. on the 7th that the wire which sends electricity to the surroundings train of inner of Yamanote Line is slack in JR Tokyo station yard in Chiyoda-ku, Tokyo.
Repair work started till past 1:00 p.m.
The direction going of Omiya of the surroundings whole line of inside and outside of Yamanote Line and Keihin Tohoku Line stopped over a maximum of 5 about hours.
Since it overlapped with the morning rushes time zone, 56 were in a suspension and 80 and they influenced about 170,000 people.
According to JR East Japan, when the surroundings train of inner left in the direction of Kanda, the employee of JR East Japan which is in the middle of attendance and was present in the platform has noticed that an unusual sound was able to be heard from the pantograph, and the directive room etc. was told about it.
Since 11 in a total of 13 weights which have pulled wire by about 500K strength had fallen on the track side between Tokyo-Yurakucho, it turned out that it slackened.
It is said that the rod of iron with a diameter of about 20mm which is hanging weight had broken.
Wire is slack over about 1.5K section which faces across the Tokyo station, and the pantograph of several trains which passed through the site had broken.
The surroundings line of inner is stopped from a morning rushes time zone for about 5 hours.
Also in an area-around line and Keihin Tohoku Line, from 10:30 a.m. time, operation was stopped for wire repair.
The company is explaining "Since wire trouble is unfixable if it stops power transmission and does not stop a train, influence becomes large."