19 November, 2022

Keisei Derailment 2022 - what we know so far?

At 10:21 am on Thursday 17 November, a train derailed at a depot near Keisei-Takasago station in the east of Tokyo. According to a document issued by Keisei, the derailed train was empty coaching stock that was supposed to terminate at the very depot (i.e. no passenger onboard). It blocked tracks of Keisei Main Line and Hokuso Line for more than ten hours, and thus resulted in part suspension of service that lasted until 8:49 pm. Nobody injured according to the Police Agency.


Skyliner approaching Keisei-Takasago station

Keisei-Takasago is a hub station, as there is a depot nearby and Hokuso Line branches off. All Skyliner services that connect Narita Airport and Ueno, and major commuter trains to and from Ueno and Toei Asakusa Line (underground) run. All of these services have been cancelled due to the derailment, and the accident severely affected not only local residents but also businesspeople and tourists (including those from abroad).


It took longer than initially expected to resume services, as workers struggled to reinstate the train to the track. As the video shows, even jacking the train up was not always easy for them. The train was stored eight hours after the derailment, and now awaiting investigation conducted by both the company and the authorities.

The train derailed exactly at a point (or "railroad switch" in American English). According to mass media (such as TBS News), the driver reversed the train without authorisation as the train entered to a wrong track. If this description is correct, it is possible that the driver also overlooked a signal, as points and signals are generally interconnected.

Needless to say, train reversal without authorisation is a material breach of rules. He should have reported the mistake to the control room before going back. If the train had been on further, the train could have completely blocked mainline tracks and thus caused a major crash with other passenger services, or hit a person or a vehicle at a level crossing nearby. The investigation is still at an early stage, but it is highly likely that the driver involved will face a punishment if not criminal.


Keisei 3700 series

The derailed train was unit No. 3788 of Keisei 3700 series, which was registered for mainline use on 1 March 1996. The unit will certainly be taken out of service and stored for months whilst investigation is carried out. Since it is nearly 27 years old (and thus not new at all), and the crucial front carriage was severely damaged, it is not certain whether the company will repair the train and reinstate it to services or send them for scrap.

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