Three days of national mourning declared
There are many students in Thessaloniki, where that train was traveling, and it is assumed that many of them would have been returning after a break for Greek Catholic lent.
Boakyewaa Lawrencia 
Greece's prime minister has announced a three-day time of national mourning.
All public events have been canceled, and until Friday, the flags on government structures will flutter at half-staff.
There are reportedly "many young individuals" on board.
According to individuals it spoke to at the scene, the passenger train that was involved in the collision was about two-thirds full and included a large number of young people.
It's estimated that 350 individuals were on board.
There are many students in Thessaloniki, where that train was traveling, and it is assumed that many of them would have been returning after a break for Greek Catholic lent.
Reuters quotes a woman saying "my child is not picking up the phone" as she anxiously waited at a railway station in Thessaloniki.
The city's student associations are calling for a full investigation with no "cover-up", according to local media
