https://www.youtube.com/watch?v=6-91haMdx3o
Fuxing high-speed trains were withdrawn from service, and those that remained on the tracks could operate at a limited speed for a full 6 years. Indeed, it has been that long since the catastrophic accident in which a Fuxing high-speed train derailed at a speed of 300 kilometers per hour, costing the lives of over 40 passengers.
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Chinese authorities have allowed a few trains capable of achieving high speeds to resume service, up to a maximum of 350 kilometers per hour. Fuxing trains have been and will continue to operate on the route between Beijing and Shanghai, and thanks to the high speeds, this journey takes passengers half the time.
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All 7 trains that are permitted to reach high speeds are now equipped with systems that detect even the slightest threats to passenger safety. In case of danger, the systems automatically slow down and stop the trains.
The concessionaire managing the trains aims to increase their speed to a maximum of 400 kilometers per hour, and it is estimated that China has a total of 19,960 kilometers of track suitable for high-speed trains.
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Incidentally, the train accident in 2011 resulted in a detailed investigation by Chinese authorities responsible for transportation, from the Ministry of Transport onwards. Investigators uncovered a range of corrupt activities, and two government officials were sentenced to death on suspicion of corruption and abuse of power.