What caused the Tokyo railway power outage affecting 673,000 passengers?

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The Tokyo railway power outage was caused by a failure to restore electricity after overnight maintenance work at Tamachi Station.

A power outage on Friday disrupted the morning commute for approximately 673,000 passengers in Tokyo. Trains on East Japan Railway’s (JR East) Yamanote and Keihin-Tohoku lines experienced halts lasting up to nine hours due to the incident.
Failure to Restore Power Post-Maintenance

The railway operator, JR East, stated that the outage occurred because power was not restored after maintenance activities were completed overnight at Tokyo’s Tamachi Station. This failure left both the Yamanote and Keihin-Tohoku lines without electricity early Friday morning.
Smoke Observed from Trackside Equipment

A spokesperson for JR East reported that smoke was observed emanating from a track-side equipment box located near Tamachi Station. This visual anomaly suggests a potential issue with electrical infrastructure at that specific location.
Significant Commuter Disruption

The disruption significantly impacted a large number of passengers during peak morning hours. The Yamanote Line, which serves major stations like Shinjuku, handles an estimated 3.5 million passengers daily, while the Keihin-Tohoku Line connects key hubs including Tokyo and Yokohama. Passengers were seen evacuating stranded trains by walking along the tracks, assisted by emergency personnel.

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What caused the Tokyo railway power outage affecting 673,000 passengers?

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