Spain said Friday it is reviewing its railway network to boost safety after a train derailed last month killing 79 people, the country's deadliest train disaster in decades.

"Everything is under review and subject to proposals for improvement," Public Works Minister Ana Pastor told a parliamentary panel about the July 24 crash.

A Spanish train was hurtling around a bend at 179 kph (111 mph), more than twice the speed limit, when it leapt off the tracks in a disaster that killed 79 people, a report on its "black box" recorders revealed Friday.

The train driver was on the telephone to the on-board conductor and stopped speaking just 11 seconds before the derailment near the northwestern city of Santiago de Compostela on July 24, said the report.

Tired and drained after supporting families of the victims of the train crash in Spain that killed at least 78 people, psychologist Jorge Carballido is amazed by the "human strength" on show.

"The resistance they have, the strength they have," said the 40-year-old, his voice breaking, standing in front of a municipal building in the northern city of Santiago de Compostela.

Spain will observe three days of mourning for the victims of a train crash that killed at least 78 passengers and injured more than 140, Prime Minister Mariano Rajoy said Thursday.

"Today I will sign a decree declaring three days of official mourning in all of Spain," he told reporters in his hometown of Santiago de Compostela where the disaster occurred on Wednesday.

A priceless 12th century guide to Spain's Way of Saint James pilgrimage, the Codex Calixtinus, has disappeared from the cathedral of Santiago de Compostela, police said Thursday.

One of the Western world's first 'guidebooks', it is only shown to the public on special occasions such as Pope Benedict XVI's visit last November to the northeastern Spanish city.