Antique Dual Air Horns - Military ? Truck Boat Train ?

Description

Trying to make room in my basement.  Been hitting garage, estate and auctions for well over 40 years.  Time for stuff to move on!  These horns measure 24" and 19" long.  Missing paint, some rust.  Have absolutely no idea if they work.  Pretty heavy duty!
Payment is expected within 7 days after auctions end unless other arrangements are made.    bfr