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A sample of Railpro's new ULT (ultimate series) 7FDL-17 Modern prime mover file. The recording was taken from a prototype C44-9W under load through all 8 notches.
This video is limited by my lack of proper recording equipment. The sound you hear in the video is nowhere near as good as it sounds in person. But it at least can give you an idea for what this file sounds like.