What will be the lessons from Texas Panhadle collision?

[CShaveRR]

Pedro, Positive Train Control (PTC) has been mandated for most American railroad lines, including this one (it is high-density, and transports hazardous materials).  It is supposed to be implemented by 2018.  There are probably a number of discussions here that mention it, in glowing terms and not-so-glowing.  

I haven't been following this accident like I should, but if what I've heard is accurate (head-on, near a control point), it sounds like precisely the kind of accident PTC would have prevented.  

[pedrop]

Railway accidents happen since the beginning of the steam age, and head-on collisions are always the most serious and feared accidents. The traffic safety technology has evolved a lot since the first steam trains to modern trains controlled by computers, but still the same types of accident are repeated every year worldwide. Some people argue that the human factor is the cause of the most serious train accidents, but it was no time to have a technology or methodology able to avoid tragedies like what happened in Panhandle days ago? 

I worked in the Brazilian Air Force for thirty years and participated in the prevention of aircraft accidents teams. In aviation, the primary goal of accident investigation is to learn from them to prevent further similar accidents. The punishment of the guilty is irrelevant in determining the causes. What matters is to find out the failures and how to avoid them. Thus, the global aviation share experiences and mutually to help in the prevention of aircraft accidents. And the railroad? What lessons we will have from Texas Panhandle collision? It is just a failure of technology? Or lack improve the methodology that makes the man interact in perfect safety with the movement of trains? This is not to blame men and machines, but to investigate where and why the interaction of both failure.