Tsurumi line is a commuter rail in Yokohama and Kawasaki cities, roughly 20 km (13 miles) south of Tokyo. The line is just 9.7 km (6 miles) long including two short branch lines, and the lines lie in an industrial district with factories and plants. Not only passenger trains but also freight trains run.
Despite being in large cities with a population of 3.7 million and 1.5 million people respectively, Tsurumi line looks like a railway in a rural town. It is fully electrified (except a few sidings for freight trains), but passenger trains are formed of just three coaches. Trains run every five minutes in the morning but every 20 minutes during off-peak times between Tsurumi and Hama-Kasawaki. There are significantly fewer services on branch lines: every 80 minutes on Umi-Shibaura branch line and just three trains a day on Okawa branch line (weekend). All stations but Tsurumi have been unstaffed since 1971, and some stations are so shabby that look abandoned.
The line had been served by secondhand trains reallocated from other lines for decades, but a brand new E131 series was introduced in December 2023. It is the first "genuine" new train since the line was nationalised in 1943.
Since 16th March 2024, all Tsurumi line services have been driver-only. Thus, there will be no conductor onboard. The new train will make the service even more efficient, environmentally friendly and less costly than before.
This morning, a bullet train overshot a platform by 500 metres. Tohoku, Yamagata and Akita Shinkansen were closed for more than three hours, causing severe disruptions on the rest of the network. No injuries have been reported so far, but this incident could have resulted in a fatal crash killing tens or even hundreds of people.
It is suggested that it was not a driver's fault but the company's negligence, but an official investigation is still at an early stage. This article summarises the case and past accusations published by a trade union, which might be beneficial to understanding that the Japanese railway is not always perfect and might no longer be as safe as before.
According to NHK, Yamagata Shinkansen service Tsubasa 121 from Tokyo to Shinjo failed to slow down when approaching Koriyama station at around 7:30 am and overshot the platform by approximately 500 metres. The driver found that the train was out of control just before entering the station and made an emergency announcement that the train could not stop. Passengers felt significant shocks amid fears. Fortunately, nobody was injured. They could alight from the train 80 minutes after the overshooting. JR East insists that chunks of snow between wheels and rail or inside the braking system significantly reduced friction and thus air brakes did not work.
It could have been a major disaster. The train passed points faster than speed limits, which could potentially lead to a derailment. Moreover, it could have been hit by another train, either a subsequent service or an opposite one. In fact, a train on the other track was due to arrive at Koriyama a minute later (Yamabiko 206 for Tokyo).
Tohoku region has been well known for a heavy snowfall. Hence, all bullet trains have been equipped with enhanced braking systems and heaters. JR East argues that even with these equipment and devices cannot prevent all abnormalities.
However, this incident could have been avoided easily if JR East had learned from the past. It was revealed last year that E3 series, the rolling stock for Tsubasa with each unit consisted of seven carriages, did not have enough braking power in winter. On 18 December 2022, a similar incident occured precisely at the same location due to snow. At around 10:05 pm, Tsubasa 159 overshot the platform by 160 metres. JR East Transport Service Workers Union urged the company to review its safety procedures in the following month, and the company conceded that all Yamagata Shinkansen trains would face the same problem in winter and promised to do something. Therefore, the company decided to add an empty 10-car E2 series (with more powerful brakes) train to Tsubasa even though only seven out of 17 carriages in total were for passenger use. JR East and the trade union considered that it would have enough power to slow down and stop the train.
Nevertheless, JR East apparently did not take such a measure this winter despite knowing that Tsubasa without a 10-car train would cause the same incident, and it actually happened. Hence, Nature does not justify anything in this case.
As reported in January, JR East has slipped into self-complacency and failed to address safety issues. That is why, it has caused major incidents repeatedly, many of which could have been a fatal accident. Employers and employees of JR East must have been thinking that the series of incidents does not matter as nobody died yet, but they were just lucky. It is reminded that "Disasters don't just happen. They're a chain of critical events".
