China promises thorough investigation . Chinese media reports that flaws in railway signalling equipment led to the deadly train crash . Wenzhou , China ( CNN ) -- Acknowledging strong public anger and skepticism over the government 's handling of a deadly bullet train collision last weekend , Chinese Premier Wen Jiabao Thursday promised a thorough investigation into the accident and its aftermath . China has built the world 's longest high - speed rail network . Thirty - nine people died in the fatal train accident .
China promises thorough investigation . Chinese media reports that flaws in railway signalling equipment led to the deadly train crash . China has built the world 's longest high - speed rail network . Thirty - nine people died in the fatal train accident .