Apulia train crash probe

Italy Apulia train crash probe focuses on alert system

They are looking into one of the black boxes recovered at the scene of the collision, on a remote single-track line north of the city of Bari.

The system relied on telephone calls and "human error" remains the main line of inquiry, reports say.

Dozens of rescue workers are still searching the wreckage.

The inquiry is focusing on the lack of automatic signalling system on a small part of the Italian railway network.