China has again launched the world's fastest bullet train on Thursday, running at 350 kilometres (217 miles) per hour.

The trains will service the route from China's capital Beijing to Shanghai, making the 1,250-kilometre (777-mile) journey in under four hours and 30 minutes.

China first ran trains at 350 kilometres per hour in August 2008, but cut speeds back to 250-300 kilometre per hour in 2011, following a two-train collision near the city of Wenzhou that killed 40 people and injured 191.

China has laid more than 20,000 kilometres (12,400 miles) of high-speed rail, with a target of adding another 10,000 kilometres (6,214 miles) by 2020.

Qi Yanhui, Deputy Director of China Railway's Science and Technology Department, said the technology used for developing the train could also be adapted for railway products overseas.