When I pulled off the road to take some pictures at a scenic vista a few weeks ago, there was a truck parked nearby that was customized with railroad paraphernalia and the rack of horns that you see above.
I said hello and asked if the horns were real or ornamental. He assured me they were real and were all different types of train horns. I had the pleasure of meeting the Locomotive Train Addict and his grandson. We chatted for a few minutes while they had a bit of breakfast. He gave me a card with the link to his YouTube channel.
You can check out one of his videos here.