The top speed of the Fuxing bullet trains in mainland China was capped at 300km/h (186mph) in 2011 following two crashes that killed 40 people.
Starting next week, some of the trains will once again be allowed to run at a higher speed of about 350 km/h.
The higher maximum speed should cut about an hour off the journey time between Beijing and Shanghai.
By 21 September, seven of China’s bullet trains will be permitted to travel at the increased maximum speed.
To mark the return to the higher speed, the trains have been named “Fuxing” – Chinese for rejuvenation.
All the trains have been fitted with an improved monitoring system that will slow and stop the trains automatically in the event of an emergency.
