Carriages were thrown off the tracks, crushed and engulfed in flames when a high-speed passenger train with more than 350 people on board collided head-on with a freight train late on Tuesday.
The union said it wanted a clear timetable for the implementation of safety protocols. "The operation is under way, it was planned to end today, we hope it will end today but there's always the unknown factor," a fire brigade official said.Amid shock and sorrow in a country where three days of national mourning have been declared, families and friends said they wanted answers over how such a crash could have happened.
Katerina, whose anger was directed at the government and the rail company, had, like other relatives looking for loved ones, given a DNA sample to try and identify her brother.