Several carriages of both the trains fell off the bridge while others got derailed following the accident last night.
The latest probe result released by Zhejiang provincial government said the accident occurred at 8:27 PM yesterday at the section of Shuangyu Town in Wenzhou City, when high-speed train D301 crashed into another bullet train D3115, which was stuck on the tracks following power failure due to lightening.
Chinese President Hu Jintao and Premier Wen Jiabao called for all-out efforts to rescue passengers and ordered to make rescue work a priority, Xinhua news agency reported today quoting an official statement.
Four coaches of D301 fell off the viaduct as a result.
Mayor of the Wenzhou City, Zhao Yide told state run Xinhua that there were more than 1,400 passengers on the two trains, and the uninjured had been transported by buses.
"Searches are underway and we won`t allow a single sign of life to slip away," said Zhao.
Two coaches fallen onto the ground were overlapping off the bridge which needed cranes and cutting machines.
The accident occurred after high-speed train D3115 was hit by lightning and lost power and then hit from the rear by another bullet train D301.
The high-speed train D3115 was running from provincial capital Hangzhou to the southeastern city of Fuzhou, and the other bullet train D301 which crashed into it travelled from Beijing to Fuzhou.