I might be considered a steam guy, but I love big engine & machinery sounds. When RailPro introduced a new diesel sound replicating the EMD 645-12 engine I had to audition it. I ran it in just one of my 45 Ton diesels at first, sticking with the GE 7FDL-16 in the other. I was significantly impressed, so I uploaded it to to the other. Adding a big speaker in the trail car “Shorty” really enhances the low end.
Here is a short raw video of M-10/M-11 in an multi-unit lash up that begins with the loco start-up sequence, then the train notches up for a run-by…