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Horn Notes is a short educational podcast about train horns, the warning codes they carry, and the air-powered devices that produce them. Each episode takes one question — a regulation,...
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Horn Notes is a short educational podcast about train horns, the warning codes they carry, and the air-powered devices that produce them. Each episode takes one question — a regulation, a piece of hardware, or a safety idea — and explains it in plain language. The show is meant for curious listeners, not as a product pitch or as a substitute for official operating rules.
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Episodes & Posts
Episodes
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14 NOV 2026 · This episode of Horn Notes asks why a train horn has its particular chord and rhythm, rather than a short beep.
The discussion starts with the informal phrase "horn gun," which people often use for a portable warning horn, then turns to the locomotive horn itself. In United States practice, the Federal Railroad Administration's train horn rule calls for two long blasts, one short blast, and one long blast at a public highway-rail grade crossing. That sequence is meant to occupy a fifteen-to-twenty-second window. It also covers the loudness limits in 49 CFR 229.129 — ninety-six to one hundred ten A-weighted decibels, measured one hundred feet in front of the locomotive — and explains what a quiet zone changes, and what it does not. Routine sounding can be set aside when other crossing protections are in place, but a crew may still use the horn in an emergency.
The second half is about the sound itself. An air horn stores compressed air in a reservoir, then drives a diaphragm in each bell so several tuned pitches arrive together as a chord. A cordless, battery-powered train horn uses the same idea on a smaller scale: a rechargeable battery, a compact compressor, a small tank, and one or more trumpets. Makers of portable train horn guns, such as https://hornguns.com/, describe devices built around that battery-and-compressor arrangement. They are not railroad safety appliances. It closes with hearing safety and the NIOSH recommended exposure limit of 85 dBA over an eight-hour workday.
Horn Notes is a short educational podcast about train horns, the warning codes they carry, and the air-powered devices that produce them. Each episode takes one question — a regulation,...
show more
Horn Notes is a short educational podcast about train horns, the warning codes they carry, and the air-powered devices that produce them. Each episode takes one question — a regulation, a piece of hardware, or a safety idea — and explains it in plain language. The show is meant for curious listeners, not as a product pitch or as a substitute for official operating rules.
show less
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| Author | Horn Notes |
| Organization | Horn Notes |
| Categories | Education , Science |
| Website | - |
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