THE ASAHI SHIMBUN
October 7, 2025 at 13:03 JST
Railway accident investigators from the Japan Transport Safety Board inspect the trains that collided in Kawasaki, Kanagawa Prefecture, on Oct. 6. (Tetsuro Takehana)
The Denentoshi Line, a major commuter railway serving Tokyo and Kanagawa Prefecture, resumed normal operations on Oct. 7 after service had been halted the previous day due to a collision and derailment.
Tokyu Railways announced on Oct. 7 that a total of 1,107 train services on the Denentoshi Line and the Oimachi Line, which operates through services with the Denentoshi Line, were canceled, affecting about 652,000 passengers.
Following the accident that occurred late on Oct. 5, the Denentoshi Line suspended operations from the first train on Oct. 6 between Saginuma and Shibuya stations until around midnight.
On Oct. 7, the Denentoshi Line and Oimachi Line were operating on their regular schedules from the first trains of the day, with no issues reported at any stations, Tokyu Railways said.
According to Tokyu Railways and the transport ministry, the accident occurred at Kajigaya Station in Kawasaki, Kanagawa Prefecture, at 11:04 p.m. on Oct. 5.
A local passenger train with 10 cars traveling from Chuo-Rinkan Station to Shibuya Station collided with an out-of-service 10-car train that had stopped on a siding track. The accident occurred as the local passenger train was about to enter the inbound platform at Kajigaya Station.
There were no injuries reported among the 149 passengers on the local train and the five train drivers and conductors aboard both trains.
The Japan Transport Safety Board dispatched railway accident investigators on Oct. 6.
Following the accident, Denentoshi Line trains operated between Saginuma and Chuo-Rinkan stations, while Oimachi Line trains ran between Oimachi and Futako-Tamagawa stations during a safety inspection on Oct. 6.
The Denentoshi Line trains are equipped with an automatic train control (ATC) system, which constantly regulates train speeds through automatic braking to prevent collisions.
However, it is believed that the system wasn’t activated before the accident. Tokyu Railways is investigating the cause of the system failure among other factors.
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