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Train crews may also sound their horns when there is a vehicle, person, or animal on or near the track, and the crew determines it is appropriate to provide warning. Crews may also sound the horn when. there are track or construction workers within 25 feet of a live track, or when gates and lights at the.
The Train Horn Rule and Quiet Zones. Under the Train Horn Rule (49 CFR Part 222), locomotive engineers must begin to sound train horns at least 15 seconds, and no more than 20 seconds, in advance of all public grade crossings.