The AirChime K5 is the godfather of all train air horns! Still in use today, the AirChime is used on commercial locomotives all around the country. This AirChime train horn is of the highest quality construction and guarantees amazing performance! This horns incorporates five heavy-duty die-cast kettle drum bells with a high flow five-way manifold. The K5 horn is the real deal: not only is it the loudest horns, but a genuine locomotive air horn. It doesn't imitate the sound you hear from diesel locomotives, it is the sound you hear from diesel locomotives. You'll be heard for miles with a set of these horns!