This is a older video showing how ETMS (BNSF's version of Positive Train Control) works. Since the system is still a work in progress things in this video are likely to change for the better but it's still a great demonstration of how the system works. In the end it will just make for a safer railway.
ETMS stands for Electronic Train Management System
PTC stands for Positive Train Control
More info can be found at www.bnsf.com