Collision Course: Two trains crashed in the Rocky Mountains, but why were they on the same track? An inquiry reveals the shocking truth about those who run Canada's freight trains.

Head on Collision: Eighty people died when the Express Samina sank near the Greek island of Paros. How did it hit a rock that rose 25 metres out of the sea? Experts investigate.

Runaway Train: A freight train travelling through the calm suburb of San Bernardino derails and crashes, destroying homes and taking lives. Two weeks later, more carnage follows.