are unaffected. In a crowded yard or in hilly or mountainous terrain, it is not uncommon for the link to be temporarily lost.

As long as there is not an emergency or penalty brake application that eliminates the link, the system will reconnect automatically or the operator can attempt to reconnect manually. Originally the loss of connection would result in the remote units remaining in their last-commanded throttle or dynamic braking position. Later system versions and software updates typically reduce the remote unit power setting to