The accident happened in the west of the Chinese capital on the above-ground section of the Changping-Pinging metro line.
The authorities are investigating the cause of the accident, according to current information, it was caused by a failed braking maneuver of the first set on a slippery track, the China Daily newspaper reported, citing the transport authorities.
The driver of the next train failed to brake in time and crashed into the rear of the first train. The impact caused the last two carriages of one of the sets to become detached. It is not clear which subway disconnected, wrote the British BBC.
Of the 515 people who were taken to the hospital for a check-up, 102 suffered fractures, writes the AP agency. On Friday morning, 67 injured people remained hospitalized.
Footage posted online shows passengers crammed into carriages, left in the dark due to power cuts. A few of them try to break windows with emergency hammers to get some fresh air.
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The incident drew furious comments from local residents. Some were shocked by the number of injured, while others complained about the inconvenience caused by the collision.
“Does the Beijing subway have no maintenance staff? No routine inspection? We are taking the lives of hundreds of people too lightly,” wrote one user on the Weibo social network.
Beijing Metro apologized for the incident and added that the company would cover the medical bills of the injured. The unusually heavy snowfall that began in the Beijing area on Wednesday forced the suspension of some trains and the closure of some schools.