“The evacuation process is ongoing and is being carried out under very difficult conditions due to the severity of the collision between the two trains,” Fire Service spokesman Vassilis Varthakoyiannis said.
Hospital units used to treat burn victims had been alerted in the area, he said, and dozens of ambulances were involved in the rescue effort.
Rescuers wearing head lamps worked in thick smoke, pulling pieces of mangled metal from the rail cars to search for trapped people.
Passengers who received minor injuries or were unharmed were transported by bus to Thessaloniki, 130 kilometers (80 miles) north of the incident. Police took their names as they arrived in an effort to track anyone who may be missing.
A teenage survivor who did not give his name told Greek reporters as he got off one of the buses that just before the crash, he felt a strong braking and saw sparks and then there was a sudden stop.
“Our carriage didn’t derail, but the ones in front did and were smashed,” he said, visibly shaken.
He added that the first car caught fire and that he used a bag to break the window of his car, the fourth, and escape.
In comments to state television, Costas Agorastos, the regional governor of the Thessaly area, described the collision as “very powerful” and said it was “a terrible night.”
“The front section of the train was smashed. … We’re getting cranes to come in and special lifting equipment clear the debris and lift the rail cars. There’s debris flung all around the crash site.”
Officials said the army had been contacted to assist.
Rail operator Hellenic Train said the northbound passenger train from Athens to Thessaloniki had about 350 passengers on board when the collision occurred.
Gatopoulos reported from Athens.
