Overview

• At about 11:04 p.m. on Oct. 5, a Shibuya‑bound local struck an out‑of‑service train stopped short in a siding at Kajigaya Station, partially derailing it with no injuries reported.
• Service remains suspended between Shibuya and Saginuma on the Den‑en‑toshi Line and between Mizonokuchi and Futako‑Tamagawa on the Oimachi through section, with turnback operations on other segments.
• Tokyu’s preliminary account says excessive speed through a turnout activated an overrun‑prevention brake that stopped the out‑of‑service set before its mark, leaving its last car protruding into the running line.
• Japan’s transport safety board has investigators on site with no end time announced, and Tokyu has not set a timetable for removing the derailed cars or fully restoring service.
• Mainichi reports the local train’s ATC may not have operated normally and that the local was traveling about 48 km/h, while the out‑of‑service train was handled by a trainee driver and emergency radio alerts were received before impact.