By Emma Pinedo and Victoria Waldersee

MADRID, Oct 28 (Reuters) - At least 30 people were killed when two high-speed trains ‌collided in Spain on Wednesday, the second deadly accident ‌in less than a year on the line connecting Madrid to the southern ​Andalusia region, regional authorities said.

Footage from regional Castilla-La Mancha Television showed a derailed train with at least one carriage remaining on an elevated section of track while twisted metal, broken panels and wreckage could ‌be seen strewn across ⁠an embankment beneath the line.

Miguel, a passenger travelling with several colleagues in the rear car of one ⁠of the trains, described to COPE radio the moment of the accident.

"We heard a massive roar, a truly enormous thud that went ​on for ​10 seconds, as if the ​train were about to derail. ‌Through the right-hand window, we could see...