FIT Phase 1 Practice Exam

In distributed power operations, emergency braking relies on a continuous link between the lead locomotive and the rear power units. If that communication is lost, the rear units cannot be guaranteed to respond to an emergency brake command from the front. To maintain a clear safety standard, there’s a defined maximum time you can tolerate this loss before emergency application capability is considered lost. That specific window is sixteen minutes and thirty seconds. If communication can’t be restored within that period, procedures require treating the train as no longer having reliable emergency application capability, triggering the appropriate safety actions to bring the train to a halt. The other time options aren’t the documented threshold for this situation.