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A sample of Railpro's ULT (ultimate series) EMD 710-G3C-T2 as found on prorotype SD70ACe's. This sound file was recorded from a prototype under load, through all 8 notches.
The model has a single 28mm speaker in the stock Athearn housing, and is set for manual notching for the video.
Recording is limited on capturing the true sound from the model, but this will at least give you and idea of what the prime mover file sounds like.