Communication Protocols Flashcards

A train crew observes an object on the track ahead. After stopping, which communication action is the FIRST priority?

Answer: Notify the dispatcher of the obstruction and exact milepost location

The crew's first priority is to notify the dispatcher with the obstruction's exact location so other trains can be warned and protective action coordinated.

What is the FRA requirement for recording radio communications between dispatchers and train crews?

Answer: All dispatching communications must be recorded and retained for at least 90 days

FRA 49 CFR Part 220 requires railroads to record all dispatching communications and retain them for a minimum of 90 days.

When must a railroad employee use the phrase 'emergency, emergency, emergency' on the radio?

Answer: To immediately alert all radio users of a life-threatening or critical safety situation

Repeating 'emergency' three times is the universal railroad radio signal for a life-threatening situation requiring immediate attention from all listeners.

Under FRA signal and communication rules, what is a 'restricting' signal and how does it affect crew communication duties?

Answer: A signal requiring the train to proceed at Restricted Speed and be prepared to stop short of any obstruction

A restricting signal requires the crew to operate at Restricted Speed, prepared to stop short of anything, and does not by itself require dispatcher contact.

A conductor and engineer disagree about what the dispatcher said during a track warrant issuance. What should they do?

Answer: Contact the dispatcher immediately to re-read and re-confirm the authority before proceeding

Any disagreement about a track authority must be resolved by contacting the dispatcher for re-issuance—crews must never proceed on an ambiguous authority.

What FRA communication requirement applies specifically to helper locomotive operations on a train?

Answer: Two-way radio communication between the helper crew and the lead locomotive engineer must be maintained

FRA requires continuous two-way radio communication between helper locomotive crews and the lead engineer to coordinate braking, power, and emergency responses.

Under FRA Positive Train Control (PTC) regulations, what is the role of communication systems in PTC enforcement?

Answer: PTC uses wireless communication between locomotives, wayside devices, and dispatch to enforce authorities and speed limits

PTC systems depend on continuous wireless data communication between on-board equipment, wayside units, and dispatch centers to monitor and enforce train movements.