No requirements needed!
Copy the "K5HL_HornControl" proxyxml file, and rename to any locomotive horn sound proxyxml. (ex: "SD70 Horn"). If your locomotive is Searchlight Simulations compatible, open the locomotive horn sound .bin file with TS_tools or anything else and rename (ex: MLWAudio/16N-710G3C-II/Horn-Bell/BNSF_K5LLA_HornControl) and change it to SearchlightSimulations/NathanAirchimeK-series/K5HL_BNSF#9145/K5HL_HornControl.
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