NHK Daily News

Quote Originally Posted by NHK
Train service on the inner tracks of the Yamanote loop line in central Tokyo was suspended for nearly five hours on Monday due to loose wiring, affecting 170,000 passengers.

East Japan Railway suspended service on the Yamanote Line after finding loose wiring at Tokyo Station at around 8:15 a.m., affecting morning rush-hour commuters.
Fortunately, Tokyo's extensive train and subway system allowed most passengers to reach their destination using other lines (at extra time and cost).