Which of the following is NOT a standard braking action descriptor?

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Multiple Choice

Which of the following is NOT a standard braking action descriptor?

Explanation:
Braking action descriptors are a standardized way to communicate how effectively the train’s brakes are working. The established terms cover a range from solid to minimal braking: GOOD, MEDIUM TO POOR, and NIL. EXCELLENT isn’t part of that standard vocabulary, because there isn’t a defined category beyond GOOD in the official scale. Including it would create ambiguity or imply a level of braking performance that the system doesn’t specify. So the descriptor that isn’t a standard braking action term is EXCELLENT.

Braking action descriptors are a standardized way to communicate how effectively the train’s brakes are working. The established terms cover a range from solid to minimal braking: GOOD, MEDIUM TO POOR, and NIL. EXCELLENT isn’t part of that standard vocabulary, because there isn’t a defined category beyond GOOD in the official scale. Including it would create ambiguity or imply a level of braking performance that the system doesn’t specify. So the descriptor that isn’t a standard braking action term is EXCELLENT.

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