What is the pattern for sounding the locomotive horn?

Under the Train Horn Rule, locomotive engineers must sound train horns for a minimum of 15 seconds, and a maximum of 20 seconds, prior to entering crossings. Wherever feasible, train horns must be sounded in a standardized pattern of two long, one short, and one long. The horn must continue to sound until the lead locomotive or train car occupies the grade crossing

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1. What is a Quiet Zone?
2. Will I still hear train horns if Quiet Zones are implemented?
3. What if inclement weather or power outages cause equipment not to work?
4. Why do trains sound horns?
5. Can constant exposure to high decibel noise poses possible health risks?
6. How can a Quiet Zone INCREASE safety at a crossing?
7. Can a Quiet Zone increase property value?
8. Are any crossings under review for closure?
9. What is the pattern for sounding the locomotive horn?
10. How long does it take to implement a Quiet Zone?
11. Which crossings are under review for Quiet Zones?
12. How can I get involved?