Relatives of the 57 people who died in Greece's worst train disaster crowded into a courtroom on Wednesday, demanding justice for the victims.
The trial had already been postponed once because of the chaotic start last week.
Most of the victims were students, killed when their intercity service from Athens to Thessaloniki smashed head-on into a goods train on the same line near Tempi.
Some victims are thought to have burnt after surviving the initial collision.
Many relatives were unable to enter the courtroom last week, and that situation continued on Wednesday. Police officers allowed only those scheduled to attend.
Some complained that seats had been taken up by police, while others struggled to witness the proceedings clearly.
Defence lawyer Zoe Konstantopoulou appealed for the proceedings to be filmed, as access for families was restricted.
The February 2023 disaster is referred to in Greece as the 'Tempi crime,' highlighting negligence and corruption at the state level.
Thirty-six people are on trial, with proceedings expected to continue for years, involving 350 witnesses.
Among the defendants is a station master, alongside other railway officials and two former Italian employees of the trains' parent company.
The disaster stirred widespread anger across Greece, with accusations of a failure to utilize EU safety funding. Some experts claim the crash could have been avoided if safety measures had been implemented.
Relatives and campaigners express frustration that no politicians are among those on trial, despite the outcry and criticism of system failures.
Prime Minister Kyriakos Mitsotakis has apologized and urged patience for the judicial process while facing political challenges due to the incident.
