Within a locomotive whistle quiet zone, name a time that the whistle must be sounded for a grade crossing?

• A. Rule 529 A, B or C is in effect.
• B. At every crossing regardless.
• C. Only when traffic is present.
• D. Never whistle.

Answer: (A)

Whistle quiet zones reduce routine horn use, but safety requirements still apply. In these zones, the times when the locomotive must sound the whistle for a grade crossing are defined by Rule 529 A, B or C. So the correct practice is to follow Rule 529 A, B or C for when the whistle must be sounded, rather than sounding at every crossing, only when traffic is present, or never. The rule-set explains the specific conditions under which whistle use is required within the quiet zone, balancing noise reduction with crossing safety.