A specially constructed horn built with an extra air chamber to produce a powerful train horn sound. This attractive horn produces an echo sound that replicates the horn of a speeding locomotive. The trumpets are entirely metal, triple chrome plated to withstand all weather conditions. The metal mounting base secures to the vehicle with a rubber gasket and stainless steel bolts, which will provide a secure water-tight installation. The air feed connection has been designed to mount easily and to be hidden from view. This will enhance the appearance of any truck. Requires an on board air system.