Beijing ( CNN ) -- A train collision in a tunnel in Shanghai 's subway Line 10 last month was caused by human error , said state media , with 12 people disciplined over the incident . Xinhua News Agency , quoting a report released by the investigation team , reported that Tang Zhihua , chief dispatcher of the Line 10 operation control center , was removed from his post . Eleven other managers and workers of the operation control and power supply sections also received penalties , including job reassignment and demotions . The two subway trains collided on September 27 in downtown Shanghai , injuring 295 passengers , 70 of whom are still receiving treatment in hospital , according to the report . `` The signal system failed to operate because of power failure . The dispatchers issued a number of erroneous orders which finally led to the crash , '' Xinhua added . The accident happened as concerns and criticism mount over China 's railway safety and its fast development of rail systems . On July 23 , two high-speed trains crashed in China 's coastal Zhejiang province , leaving 39 dead and 192 injured , making it one of China 's deadliest rail accidents in recent years .
State media : Shanghai 's subway Line 1 accident was caused by human error . The accident injured 295 people , many of whom are still receiving treatment in hospital . China 's fast development of its rail systems have raised concerns over safety .