CNN CNN International May 17, 2015 08:42:00
Should not be possible here. >> it should not be possible. >> reporter: it was rolled out quickly in 2002 and relatively cheaply, $7 million. >> over history, over time, it's more than made up for that in terms of saving people's lives. >> reporter: the uk upgraded to a more sophisticated system that should be safer, but it will take decades. this 2013 derailment in spain shows transition carries great risk. investigators say the driver was distracted as the train left a high-speed section of track with automatic safeguards and moved into a slow bend with an older, manual system. the result, 7...