JOIN USSo far, a total of 271 people have received treatment in hospitals, said Xu Jianguang, director of Shanghai's health bureau told reporters in the eastern Chinese metropolis.
Most of the injuries are bruises and bone fractures, but there are also external head traumas, doctors said. An estimated 20 injured people are in critical condition but the injuries are not life-threatening, they said.
Xu said that 180 people have already been discharged from hospital.
The accident occurred when a metro train smashed into the rear of another one after the signal system went haywire, sending the busy suburban network in China's commercial hub into a spin.
Four foreigners, including two Japanese, one each from Canada and the Philippines, suffered minor injuries.
The accident second of its kind attributed to faulty signal system took place as top Indian railway officials held talks with their Chinese counterparts to explore possibilities of using China's high speed technology back home.
Most of the injuries in today's crash were bruises and bone fractures and there were also external head wounds, doctors said.
The crash occurred about at 2:51 pm following a signal system failure at one station on the Line 10 subway, Shanghai Shentong Metro Group Co said in a statement, adding that about 500 passengers had been evacuated from the trains.
Photos posted on weibo.com, China's popular Twitter-like microblogging service, showed several passengers bleeding, with firefighters entering the train to rescue the injured.