Netcare 911 paramedics and other services responded to a train accident in Brakpan this afternoon.
Upon their arrival on scene they found that two goods delivery trains collided resulting in one overturning.
Four people were injured. One woman sustained critical injuries while another female and two males sustained serious injuries.
After the injured were treated and stabilised on scene, they were transported to nearby medical facilities for the medical care that they required.
Exact details to the cause of the accident and preceding events will remain the subject of an investigation.