Which of the following is NOT a condition for initiating an emergency brake application?

Initiating an emergency brake application is a critical procedure designed to respond quickly to situations that pose an immediate danger. The primary conditions for such an action typically involve scenarios where there is an imminent threat to safety. This includes circumstances like when life or property is endangered, when there is no response to warnings (indicating that the situation may already be critical), and when signals clearly indicate that stopping is necessary.

The reason why informing the engineer to reduce speed does not qualify as a condition for activating an emergency brake application is that this situation does not represent an immediate or critical response requirement. The communication about speed reduction is more aligned with routine operations and does not reflect the urgency or danger that necessitates an emergency application of the brakes. Emergency situations demand swift, decisive actions that are triggered by clear and present dangers rather than communications about normal operational adjustments.