From another article:
Amtrak crews have been installing “Advanced Civil Speed Enforcement” on the Northeast Corridor and other Amtrak rail routes, and were to install the system this year in the Philadelphia area.
The system is designed to prevent collisions, automatically slow speeding trains and enforce speed restrictions.
Positive Train Control, which includes Amtrak’s system, is required by federal law to be installed on all passenger and major freight railroads by the end of this year.
But many railroads have asked for more time to install the expensive systems, and Congress is considering extending the deadline to 2020.
Read more at http://www.philly.com/philly/news/20150514_Amtrak_Derailment__What_we_know.html#9yKZIBCsqMR6dJok.99
After this criminally negligent behavior by the operator of this train, the railroads can kiss off any chance they might have had on an extension.