Funny. I had a triple set of Train horns on a 99 Bounder diesel. It used so much air that I could watch the air pressure gauge drop as I blew the horn. I had to use it one time in AR to get a lady to move when the light turned green. I'm sure she had to do a pants change later. When parallel to a moving train in MO, the engineer would answer me when I blew it to him. It sure got people's attention.
2013 43 QGP Allegro Bus
CJ7 Rock Crawler