In 2013, a train carrying 218 people derailed in Spain, killing 79 and injuring 66 more. Though the train’s engineer said he couldn’t explain why the accident occurred, video footage provided answers. The train was going as fast as 119 mph before it hit the deadly curve—more than twice the speed limit for that section of track. So it wasn’t just the speed that caused the accident. It was the combination of the speed and the location of the track. The boundary of the speed limit was created for the protection of the passengers, but the seasoned engineer ignored it, and…