My grandfather had this thing in his garage we called "The Whistle Machine" - basically this Rube Goldberg looking contraption - consisting of a huge old compressor and a bunch of whistles and horns and handles.
This was the biggest horn - just wondering if anyone can ID this as train horn? And - if so, what kind of train would it have been on.
This is about 28 inches long - and has a 10 inch flare on the horn.