The driver of a train that derailed in north-western Spain, killing 78 people, was to appear on Sunday before an investigative judge for questioning, the court in Galicia said.
Francisco Jose Garzon, 52, has been charged with manslaughter. He was taken on Saturday from hospital to a police station in Santiago de Compostela.
He was held overnight in a cell at the station. He had so far refused to answer questions about the accident late on Wednesday.
One of Europe’s worst rail accidents occurred on a curve in the tracks at Angrois near Santiago de Compostela. The train derailed and split apart.
Garzon is suspected of speeding around the curve, reportedly at 190 kilometres per hour in an area with a recommended speed of 80 kph.