China's seven pairs of 'Fuxing' bullet trains are set to return to running at 350km per hour from next month, marking the end of a six-year period of speed restriction.
The increase in speed is expected to reduce the journey time between Beijing and Shanghai by an additional half an hour to roughly four and a half hours.
The trains' speed was originally restricted to 250km-300km per hour in 2011, following a train collision that killed 40 people and injured almost 200 others.
Trains capable of attaining a speed of nearly 400km per hour will begin operating on the line from 21 September, according to the BBC.
They will be equipped with an upgraded monitoring system that can reduce the speed of the vehicles or stop them completely in case of emergency.
State-owned operator China Railway noted that the Beijing-Shanghai route carries around 600 million passengers annually.
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The respective authorities have completed the successful testing of the vehicles at the higher stipulated speeds across some parts of the line last month, reported South China Morning Post.
China currently features a network of more than 20,000km of high-speed rail lines and intends to construct an additional 10,000km over the next three years, making the country's rail system the largest high-speed network in the world.