Hello! I have personal experience to share. I recently upgraded my truck with a railroad horn and am very happy with the results. I found an excellent selection and reliable options at https://bosshorn.com . They offer a variety of truck horns, as well as installation kits and helpful manuals.
When I ordered from them the process was simple and the customer service was excellent. They even provided detailed installation instructions, making setup easy. The beep I received was loud and had that classic train sound I was looking for. Remember: Always install responsibly, follow local regulations, and be courteous to other drivers. Enjoy your new horn!