If I was putting train horns on a truck these are the ones I would use every time. These things are loud! (140+ decibels) They have an extra brace to support the bigger (bottom two) trumpets so that they will have a long life. Unlike the lower cost horns, replacement diaphragms are available for these. I would be happy to sell the lower cost horns to you if that is what you are looking for, but would strongly recommend these horns. These should be hooked up using 3/8" airline. They come with a solenoid for hooking them directly to air (without the need of a valve). You would need to supply your own electrical switch to activate the solenoid. You may want to use a chrome valve stand instead of the solenoid to activate the horns.  The chrome train horn valve can be found here

• Best quality
• 140+ decibel
• Brace to support lower horns
• Solenoid included
• Compatible with valve if you rather use it

This universal air horn valve will work on all trucks.  It accepts 1/2" air line.  With the beautiful chrome finish it will look absolutely stunning in your rig

• Available in 4", 7", 9", and 11" tall
• Chrome finish
• Air line NOT included
• Mounting hardware Not included.  It is available here

6757 UA46106 UP46106 46106UA 46106UP 46106