PTS - Personal Track Safety Safety Critical Communications Flashcards

Which scenario represents a breakdown in the 'challenge and response' principle of safety communications?

Answer: A supervisor accepts a worker's task completion report without verification

Accepting a report without any form of verification or challenge breaks the challenge-and-response principle, leaving errors undetected.

How should a track worker communicate their position to the Person in Charge when working in a tunnel with limited visibility?

Answer: By using the designated radio protocol to verbally confirm position and status

Radio communication using the designated protocol is the required method for position reporting in low-visibility environments such as tunnels.

What must a track worker do if they believe a movement authority issued to a train is incorrect?

Answer: Immediately challenge the authority through the correct reporting chain

A suspected incorrect movement authority must be immediately challenged through the proper reporting chain to prevent a potentially fatal incident.

During a track possession handback, what communication step is essential before the line is returned to normal operations?

Answer: Confirming all personnel and equipment are clear and formally handing back the line to the controller

A formal, confirmed handback communication to the controller that all workers and equipment are clear is mandatory before normal train operations can resume.

A track supervisor wants to extend a possession beyond its scheduled end time. What is the correct procedure?

Answer: Contact the train controller before the scheduled end time and formally request an extension

Any possession extension must be formally requested from and granted by the train controller before the original end time expires.

What is the primary risk of using informal language (slang or abbreviations) in safety-critical track communications?

Answer: It can be misinterpreted, leading to incorrect actions with potentially fatal consequences

Informal language lacks the precision of standard terminology and can be misinterpreted, creating dangerous ambiguity in situations where exact understanding is essential.

After a near-miss incident involving a communication failure on the track, what is the MOST important immediate action?

Answer: Halt work, secure the site, report the near-miss, and investigate the communication failure before resuming

A near-miss must trigger an immediate halt, site securing, and formal report so the root communication failure can be identified and corrected before any further risk occurs.