Train engineers are required to sound train horns at railroad crossings for safety reasons. In 2005, the Federal Railroad Administration developed the Federal Train Horn Rule. This new set of rules established standards for how train engineers must sound the horns, including the decibel range of the horn. At the same time, the rules established criteria that would allow for local jurisdictions (like Castle Rock) to silence the regular sounding of horns if certain improvements are implemented in place of the train horn. This is referred to as establishing a quiet zone. It's important to note that, even with the establishment of a quiet zone, train engineers can still sound the horns if they perceive a danger or a threat.
Reviewed Jan. 5, 2023.