Two years after a deadly train crash in Tempi, Greece, which killed 57 people, investigators are still trying to understand what caused the explosion and fireball that followed the collision. While the legal process is nearing its end, the exact trigger of the fire remains uncertain. The crash in February 2023, between a passenger train and a freight train, exposed serious safety failures in Greece's railway system. Experts agree on the broader causes-poor infrastructure, missing safety systems, and human error-but the fireball that engulfed parts of the passenger train is still under debate. One of the main technical reports was written by Professor Karonis from the National Technical University of Athens. In his 132-page report, he estimates that the fireball could match the explosion of 2.3 to 3.1 tons of hydrocarbons. But he also says that video evidence does not confirm this and that silicone oil, used in the train's...