Bullet train runs on the Tokaido Shinkansen Line between Tokyo and Shin-Yokohama stations were disrupted for eight hours Tuesday, affecting some 80,000 passengers, after a switch at Tokyo’s Shinagawa signal station malfunctioned, railway officials said.

The switch began malfunctioning at 4 a.m., delaying the first runs of the day. Although the switch was repaired by 5:40 a.m., service did not return to normal until noon.

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