Citation: http://edition.cnn.com/2013/07/26/world/europe/spain-train-crash/index.html?c=intl-homepage-t&page=3
The derailment was reportedly due to overspeed of the train. After the similar accident happened in Amagasaki, Hyogo, Japan, I thought railway companies all over the world would review speed limit around curved tracks or automatic train control systems.
But, new signalling system which is called ERTMS 2 wasn't fitted with the section.
It needs reviewing why conventional signalling system wasn't in order.