I must be the only one in the thread who sees this for what it actually is: Posturing by the FRA intended to help the railroad industry by pressuring congress to extend the implementation deadline of PTC out to 2020. I would bet that it eventually gets extended even further out, too. I knew right from the moment that the legislation was passed back in 2008 that there was no way that the entire industry would be able to go from basically zero to developing and installing a fully functional, inter-operable PTC system in just 7 years. It is far more of an immense undertaking than most people understand.
The technology is not ready, plain and simple. Having seen the effort that the BNSF has been putting into PTC, I am comfortable saying that if we can't do it, no one can. BNSF is a leader with the technology by having been working on their own Electronic Train Management System for over 10 years now, well before Positive Train Control was a thought in most legislators minds. While we still have a long ways to go, we have been pouring billions and billions of dollars into it, creating the hardware, developing the programming, installing upgraded signal systems and PTC equipment, refitting locomotives with PTC equipment, etc. We have essentially built all of the hardware from scratch and are now working on the programming to get it all to work together in an upscaled system. And we are still having MASSIVE problems with the operability, functionality and reliability of our PTC systems. But I am sure that we will get it sorted out some day, and then Berkshire Hathaway, our corporate overlords, will probably make a bazillion bucks licensing it out to other railroads.