24 years after Hibiya Line subway derailment that killed five people, victims mourn at the memorial monument. On March 8, 2000, the Hibiya Subway Line derailed at a curve near Nakameguro Station in Tokyo's Meguro Ward, killing five passengers and injuring 64 others.
Tokyo Metro has increased the number of derailment prevention guards from 17 at the time to 462, and is currently introducing rolling stock equipped with a system that automatically stops trains when a derailment is detected.