How many whistle blows are required to stop a moving train or to start it forward?

How many whistle blows are required to stop a moving train or to start it forward?

• A. 1
• B. 2
• C. 3
• D. 4

Answer: (A)

In mine locomotive signaling, the whistle pattern is used so operators can react quickly even in a noisy environment. A single blast is the cue to either stop a moving train or start it moving, providing a simple, unambiguous command. This consistency helps prevent miscommunication on the tracks where visibility and attention can vary. Other whistle counts are assigned to different commands, so they don’t apply to stopping or starting in this rule set. Therefore, the correct practice is a single whistle blast for either stopping or starting the train.

In mine locomotive signaling, the whistle pattern is used so operators can react quickly even in a noisy environment. A single blast is the cue to either stop a moving train or start it moving, providing a simple, unambiguous command. This consistency helps prevent miscommunication on the tracks where visibility and attention can vary. Other whistle counts are assigned to different commands, so they don’t apply to stopping or starting in this rule set. Therefore, the correct practice is a single whistle blast for either stopping or starting the train.