Around 10:20 3rd of May 2014, A train, which belong to subway line 4 of Beijing, run out tracks and blocked the South 4th ring road of Beijing at Caoqiao.

No one was injured in the incident till now. Speakman of subway line 4 said that the train was on the test line, but didn't stop in time in the test. The reason is still under investigation.

The accident doesn't impact the operation of subway line 4.