Review on 📢 GAMPRO 12V 135db Air Horn, Dual Trumpet Air Horn with Compressor, Extremely Loud Train Sound, Shiny for 12V Vehicles, Trucks, Lorrys, Trains, Boats, Cars, Vans by Anthony Jagers

It's not a "train horn" anyway, but it's a very loud horn if you connect it to existing horns and add it to an existing horn output. It comes with a small compressor that if you beep for more than 3 seconds should catch your breath. What to expect from a small compressor in this price range. IMHO, worth the price! To be honest it reminds me of a Ferrari horn.