Developed in the 1950s this K-series horn is a blast from the past. In fact, although there are many variations of the K3, the basic design has stayed the same since 1954. This horn is just about indestructible, die cast out of solid aluminum and powered by heavy duty stainless steel internals. This horn can take a beating! Still not confident about these horns? They were designed to be mounted on diesel locomotives and be exposed to the elements, snow, ice, rain, wind, and diesel smoke and still sound great! In fact, these horns were designed to be clearly audible from up to 5 miles (calm wind, clear skies). The horns are virtually maintenance free and are designed to be rebuilt with absolutely no tuning necessary.