The prime minister promised a swift investigation of the collision and said the new Greek transportation minister would release a safety improvement plan.
Rescuers continued digging through debris on Saturday at the site of Greece's worst train crash but were expected to wrap up their search operation later on the day.
After a deadly train crash, rail workers said that a key signal light was always stuck on red, and that station managers only warned one another of oncoming trains via walkie-talkie.
Families awaited DNA testing results to identify the victims of a train collision that killed almost 60 people in Greece, while workers went on strike Thursday, claiming that the country's rail infrastructure is obsolete, underfunded, and hazardous.