In a joint press conference in Brussels on the sidelines of an international donors' conference, the Turkish and Greek foreign ministers pledge to maintain solidarity.
More than 40,000 people protested nationwide, including an estimated 25,000 in capital, Athens, while a 24-hour strike forced the civil service, flights and ferries to shut down.
The tragedy has exposed decades of safety failings in Greek railways and has put major pressure on the conservative government ahead of national elections.
Public anger has focused on long-running mismanagement of the country's railway network in the wake of the February 28 train crash that killed 57 people, many of them students.
Railways remain paralysed for eighth straight day, as train workers extend strike action they launched in in central Greece train accident last week.
Greek Foreign Minister Nikos Dendias has corrected his mistake of using 'Constantinople' for the Turkish city of Istanbul on Twitter.
The 59-year-old stationmaster was charged with negligent homicide for causing Greece's deadliest train crash, which killed at least 57 people.
Police said 12,000 people had gathered by the large esplanade in front of the parliament to demand accountability for Tuesday's head-on collision near the central city of Larissa that has sparked widespread outrage.
Frustrated Greek citizens and railway workers are protesting the country's worst rail disaster while politicians scramble to restore order.
The rail union federation denounced a "lack of respect towards Greece's rail network by successive governments over the years, which led to this tragic result".
Anger over the crash prompted rail workers to go on strike to protest years of underfunding that they say has left the country’s train system in a dangerous state.
Greek police had arrested the station master at a provincial train station, accusing him of death through negligence as he denied the charges, attributing the accident to possible technical failure.
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