This horn surfaced in the files for Trainz, the railway simulator, where it was catalogued as an EMD SD70 horn even though, according to its original uploader, no specific train or locomotive in the game actually used it. That orphaned status made it a curiosity for railfans and sound collectors, who shared it as a standalone clip. The SD70 itself is a familiar heavy freight locomotive, so the deep, authentic tone keeps the sound useful for railway videos, simulations and edits long after its game-file origins.