A subway train undergoing testing derailed around 15:00 Saturday in Wuhan City, central China's Hubei Province, causing three injuries. 

Some of the subway cars derailed while the workers were conducting the test. The three injured are said to be staff members, and all suffered minor injuries with one having been discharged from the hospital after treatment. 

Experts arrived at the scene to right the overturned train. The cause of the accident is under investigation.