is a user configurable option that must be set to trip at a higher energy state than threshold u201c a u201d the intent is that threshold u201c b u201d is where an autonomous corrective control action will be automatically invoked if the user has enabled this function step 52 if the user has selected u201c enable u201d for threshold u201c b u201d then an attempt to apply braking and reduce tractive effort so as to modulate the total energy below the alarm threshold u201c b u201d trip point step 54 is undertaken if the user elects to disable the autonomous corrective control step 52 then no autonomous corrective control will be applied but rather a message will appear indicating that the train has exceeded threshold u201c b u201d and that immediate speed reduction and or brake application is necessary to prevent a runaway condition the trip point of threshold u201c b u201d may be user configured to give more or less of a margin between trip and a not to exceed limit step 56 if a determination is made step 58 that an exceedance has not occurred then evaluation of the total energy state step 50 will continue if a determination is made step 51 that an exceedance of threshold u201c b u201d has occurred and the user has enabled autonomous action step 52 autonomous action is invoked to make an attempt at controlling the total train energy level to reduce the total train energy below threshold u201c b u201d trip point additionally an annunciation to the user is issued indicating that threshold u201c b u201d has been exceeded step 60 this annunciation will remain activated until the total train energy state is below the threshold u201c b u201d trip point if the user has disabled autonomous control.