Automatic train protection
System installed in trains to prevent collisions through driver error / From Wikipedia, the free encyclopedia
Automatic train protection (ATP) is the generic term for train protection systems that continually check that the speed of a train is compatible with the permitted speed allowed by signalling, including automatic stop at certain signal aspects. If it is not, ATP activates an emergency brake to stop the train.[1]
For British Rail's implementation of ATP, see Automatic Train Protection (United Kingdom).