Thursday's walkout shut down flights as well as the civil service and ferries
ATHENS - Tens of thousands of people protested across Greece on Thursday as workers staged a mass strike to voice outrage over last month's train disaster, which killed 57 people.
The 28 February tragedy exposed decades of safety failings in Greek railways and has put major pressure on the conservative government ahead of national elections.
Police said more than 40,000 protested nationwide on Thursday, including 25,000 people in Athens and around 8,500 in each of the country's next largest cities, Thessaloniki and Patras.
"This crime will not be forgotten," demonstrators from the country's communist union PAME chanted as the crowd marched on parliament in the capital.
Students shouted "murderers" and marchers threw flyers of Prime Minister Kyriakos Mitsotakis wearing a stationmaster's cap, captioned "it's everyone's fault but mine".
The rail disaster occurred shortly before midnight when a passenger train crashed head-on into a freight train in central Greece after both were mistakenly left running on the same track.
Most of the passengers were students returning from a holiday weekend.
READ: Clashes erupt as tens of thousands protest Greek train tragedy
Thursday's 24-hour strike is the biggest yet in days of industrial action that followed the disaster, this time called by Greece's leading private as well as public sector unions.
The walkout shut down the civil service, flights and ferries.
"Things have to change in this country, we simply cannot mourn all these deaths," said Athens' protester Stavroula Hatzitheodorou, in reference to deadly wildfires that have gripped Greece in recent years as well as the train crash.
- 'Mass murder' -
"We hope that things will change in these elections," Hatzitheodorou, who works in the private sector, told AFP.
A stationmaster and three other railway officials have been charged, but public anger has focused on long-running mismanagement of the network and the country has been rocked by a series of sometimes violent mass protests.
A total of 57 people died after two trains collided on the same line in central Greece on February 28
Last week, some 65,000 people took part in demonstrations around the country, including around 40,000 in Athens.
In addition to the 57 people who were killed, several victims remain in hospital, including one passenger who is fighting for his life.
The Italian state-owned company operating rail services in Greece, Hellenic Train, said those hurt in the accident and the families of the dead would each between 5,000 and 42,000 euros ($44,600) "to cover immediate needs."
"This is in no way an admission of responsibility" the company stressed late Wednesday.
The father of one passenger who died rejected the offer.
"We don't want their money... this was mass murder, I refuse to accept an apology from murderers," Pavlos Aslanidis told Alpha TV on Thursday.
"Had this been a serious country, everybody at the transport ministry would be in handcuffs," he said.
- Polls slipping -
Greece's transport minister resigned after the crash and Mitsotakis has sought to soothe public anger by repeatedly apologising and vowing a transparent probe.
Rail traffic ground to a complete halt across the country after the accident, although acting Transport Minister Georgios Gerapetritis said this week that services would gradually resume from March 22.
The train tragedy has seen mass protests in Athens and elsewhere
Gerapetritis said a report by experts investigating the tragedy will be delivered in a month's time.
Investigators have separately opened a probe into possible railway funds mismanagement over the last 15 years.
Gerapetritis and former transport ministers will appear before a parliamentary committee next Monday to answer lawmakers' questions on the tragedy.
With public anger mounting before elections expected in May, Mitsotakis has seen a 7.5-point lead in the polls slashed to just over three percent in recent surveys.
He has come under fire for blaming "human error" for the accident and the stationmaster on duty at the time, who allegedly routed the trains onto the same stretch of track by accident.
But railway unions had long been warning about problems on the underfunded and understaffed train network.
Mitsotakis had been expected to set an April election date. Ballots are now expected in May.