The judge investigating the train crash that killed 79 people last July is expanding the preliminary charges to include numerous top officials of the state railway infrastructure company, Adif, for alleged negligence, a Tuesday court order shows.

Judge Luis Alaez Legeren wrote that five Adif officials in charge of track and signal security, along with the current and two former Adif presidents, will face preliminary charges because there was no safety system that would have compensated for any human error by the train driver.

The prime suspect remains the driver, Francisco Jose Garzon, who already faces preliminary charges of 79 counts of homicide by professional recklessness.