Dhaka, Oct. 29 -- Audio recordings published by Spanish media have revealed exchanges between train drivers and a railway control centre shortly before a collision that killed at least 69 people and injured dozens, the BBC reports.

The crash occurred on Wednesday when a Renfe train travelling from Madrid to Seville struck the rear of a stationary Iryo train near Urda, in Toledo province. The two trains were carrying a combined 544 passengers.

The recordings, published by El Pais and RTVE, appear to show the Renfe driver being cleared to continue despite signalling problems.

After the controller instructed the driver to proceed at normal speed, the driver asked, "At normal speed?" The controller replied, "Yes."

In a separate exchange, ...