Shanghai safety authorities have said a subway train crash last week was caused by negligence, and that three train operators have been removed from their posts. The Shanghai Administration of Work Safety said nine other subway train managers and workers were also punished after one train crashed into a stationary train on September 27, injuring around 290 passengers. The administration said a loss of power on the subway line caused the signal system to fail. It said dispatchers issued a number of wrong orders that led to the crash. The subway crash was a shock for Shanghai, a city of 23 million that had its entire transport infrastructure - roads, airports, ports, tunnels and subways - upgraded ahead of the city\'s 2010 World Expo.