Tens of thousands march in Athens after train disaster.

STORY: The crash on February 28 killed 57 people and has stirred public outrage over the crumbling state of the rail network. Striking workers say years of neglect, underinvestment and understaffing - a legacy of Greece's decade-long debt crisis - are to blame.

Many of the around 350 people aboard an intercity passenger train that collided head-on with a freight train while travelling on the same track were university students heading to the northern city of Thessaloniki from Athens after a long public holiday weekend.