Spain' Discovery Network International presents a second-by-second analysis of Spain's worst train disaster, and delves into the important questions that surround the fatal incident: what caused the train to derail? Was there a catastrophic technological malfunction or driver error? Or was it a combination of the two? Was the train going too fast? And what did the driver do in the moments before the crash? This one-off program also looks ahead to the future of train travel in the wake of this terrible event, featuring contributions from leading researchers and train engineers about the world's most advanced train safety technology. As Europe and other parts of the world move towards creating a high speed rail network across continents, the program explores whether we are at risk of creating a network more susceptible to serious train disasters. Exclusive footage filmed by cameras at the scene of Spain's Worst Rail Disaster explores the implications of this rail disaster for the future of high-speed train travel.