Rail workers across Greece have begun a one-day strike after Tuesday's train crash which killed at least 43 people, SIA refers to foreign media.
"Pain has turned into anger for the dozens of dead and wounded colleagues and fellow citizens," the workers' union said in a statement.
The walkout follows protests in Athens, Thessaloniki and the city of Larissa, near the site of the disaster.
Rescue workers are still going through burned and buckled carriages, searching for victims.
This was the "most difficult moment", rescuer Konstantinos Imanimidis told Reuters news agency, as "instead of saving lives, we have to recover bodies".
The incident happened just before midnight on Tuesday. A passenger train carrying 350 people collided with a freight train after both ended up on the same track - causing the front carriages to burst into flames.
The railway workers' strike began at 06:00 local time, affecting national rail services and the subway in Athens.
Many in Greece see the crash as an accident waiting to happen, and the union blamed successive governments' "disrespect" towards Greek railways for leading to this "tragic result".
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