A passenger train derailed in southern England today, causing three carriages to overturn. The incident occurred earlier today, with details still emerging regarding the cause and extent of injuries. Emergency services are currently at the scene, working to assess the situation and provide assistance to those affected. Authorities have initiated an investigation to determine what led to the train leaving the tracks. The derailment is expected to cause significant disruption to rail services in the area. Further updates will be provided as more information becomes available from officials on the ground.