Review on 🚂 COOCHEER 150DB Train Air Horn Kit: 4 Trumpet Loud Train Horns for Trucks, Cars, Boats & More - Powerful 120 PSI Air Compressor Included! by Hikeboy Ramey

That thing is as loud as the law allows! That worked really great for me. I tried wiring it to the horn button but I'm either not very smart or I missed something or there was something wrong with my wiring lol but my horn button kept blowing fuses so I just over it plugged in a spare relay. There was a spare momentary button, and BAM now works fantastic. I even added a "T" to the tank and a small coiled air hose to inflate the tires when needed.