My grandfather made this thing...probably in the mid-sixties. When I was a kid - I couldn't wait to get to my grandparents house - the first thing I wanted to do was fire up the whistle machine! My uncle - kept it right where it always was - when he passed - I was allowed to take it. Unfortunately - the compressor was too big - and pretty shot - to move - so I had to dissemble it. Kind of a bummer - since I really liked the organic Rube Goldberg-ness it had. I do plan on rebuilding my own version of the whistle machine - but I doubt it will be as cool as the original.
Many - if not most, of the whistles and horns are homemade - or not train horns/whistles. They lived right along Lake Erie - so Im sure there are some nautical items too.
You can't see the big diesel horn too well in these pics - referred to in this thread