A criminal trial opened in Greece on Monday over a train collision that killed 57 people, many of them college students, in a disaster that horrified the country and revealed long-neglected safety failures.The February 2023 crash triggered a fireball on impact and left passengers trapped in mangled rail cars.Most of the 36 defendants - all rail and transport officials - face serious charges linked to endangering public transport.The crash occurred at Tempe in northern Greece after a passenger...