It’s still not clear what caused the crash, which occurred on a distant single track line north of Bari.
Nevertheless, among the trains’ black boxes continues to be recovered at the scene.
Heavy lifting gear and cranes operated through the night to clear the debris of both trains which crashed at high speed.
Fifteen individuals are being treated in hospital for his or her injuries, and a few of them stay in a critical state.
The military is helping the operation near town of Andria in the southern area of Apulia.
Italian PM Matteo Renzi promised a complete investigation and seen the website.
Right now, “human error” stays the inside line of inquiry, reports La Repubblica newspaper.