A devastating collision between two high-speed trains in southern Spain has resulted in at least 40 fatalities and numerous injuries, with rescue efforts ongoing as authorities fear more bodies may be discovered. The incident, described by survivors as resembling an earthquake, has shocked the nation and prompted Spanish Prime Minister Pedro Sanchez to promise an investigation into the causes of the accident, including reports of a broken joint on the track and severe wear and tear warnings that had been issued by the rail operator. The crash, which is being called the worst train disaster in over a decade, prompted three days of mourning across Spain as the community grapples with the tragedy.