Looking for a steam whistle

So a little back story I have a 1964 caddilac hearse rat rod that I recently acquired and I want to find a whistle either from a retired steam engine an old factory or new that I can mount on the fender everyone does train horns I want to be different I've been through Amazon and a few other online sources but nothing has been quite right or has been an electric reproduction I have knowledge with pneumatics so hooking it up isn't a problem if anyone can help I would really appreciate it