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Well, seems like a Shinkansen derailed. It doesn't seem very serious as there's someone tweeting about it from inside that train...[1] There's also a tweet that the part of the overhead power line broke off and fell[2], so it may take a while to get back in service...

[1]: https://twitter.com/tokimemo1130/status/1504110997732139024

[2]: https://twitter.com/R19i90/status/1504112207746936832

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I would be interested to know more about the derailing. The shinkansen network has automated quake protections that stop the trains when a quake is detected, while that's not a foolproof system, I am sure a derailment at full speed would be very different to this picture. Either it worked or the train was at a slower part of it's journey, perhaps even stopped.

Shinkansen moves fast enough it's difficult to fully stop in time unless it gets a decent amount more warning. Probably slowed down enough it was pretty minor though.

It probably slowed down/stopped for the first quake before the 7.3 hit and derailed it?

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