The Nathan AirChime K5LA is the God Father of all Train Air Horns. Still in use today, the Nathan K5 is used on Commerical Locomotives all across this Country.   HEARING PROTECTION IS REQUIRED ! The Genuine locomotive horn features Stainless Steel diaphrams to prevent rust.  These are the only Sand Cast horns we sell and provide an unparralleled railway train horn sound.  Features heavy duty sand cast aluminum construction, exclusive p-series mellow tone locomotive acoustics, large one half inch air inlet for excellent air flow and reversible bells for custom configuration.  SHIPPING IS FAST AND FREE.  Available in aluminum or Black Finish.