This is a sample of Railpro's ULT (ultimate series) EMD 16-645E3 prime mover file. The video shows startup and shutdown, all 8 notches and transitions. The source recording was made from a prototype SD40-2 under load.
The video captures the sound as it plays from my locomotive. My video equipment is unable to capture all the subtleties in the sound, therefore it sounds much better in person than on this video. However, this should at least give you a taste of the quality of the sound.
