Sweeet. Very nice. Should command attention (and likely aren't street legal in many places).
I have an electronic airhorn on my vehicle (for clearing traffic), but always thought some good horns would work better. I have a small collection of authentic train horns; an interest I developed when a train derailed in my town in '68 and a lone horn ended up in tall grass and was missed during the cleanup. It took some trimming of the diaphragm to get 110 psi to push it. Very deep and resonant; similar to a single-tone fog horn. Had fun with that as a kid and it serves as the base for a bird bath at my Mother's place now.
A couple of years ago a friend in the marina upped the ante when he put some aftermarket "train horns" on his boat, so I finally mounted an authentic set of KL5A's (of Amtrak fame) on my houseboat. Only use them to acknowledge the charter dinner boat that docks across from me when he hits his on the way out of the marina. They're the real deal - right off the train. They're pretty obnoxious.