Seoul subway train got faulty signal before crash
Cause of crash a malfunction in the automatic distance control system, CEO of Seoul Metro says

A subway train got a faulty ‘go’ signal before it ploughed into another train in the South Korean capital, slightly injuring more than 240 people, the subway operator said on Saturday.
Though the case is still under investigation, the malfunction in the automatic distance control system is presumed to have caused the crash on Friday afternoon, Chang Jung-woo, CEO of Seoul Metro, told reporters.
“Normally, the signal should be given in the order of ‘stop’ and then ‘caution.’ But at the time of the accident the signal was given in the order of ‘stop,’ and then ‘go-ahead’,” Chang said.
The driver of the moving train applied its emergency brakes after noticing the stopped train ahead, but wasn’t able to halt it in time, Chang said.

Hospitals treated 249 people, mostly for bruises and minor injuries, though three had surgeries for broken bones, according to Seoul Metro.