Forgot to mention,
regarding BLI’s “Diesel” engine or sounds on their EMD locomotives.
Prototype EMD:
Switchers: SW-1 through 9, NW-2, TR-2,
Carbody Units: FT, F3 thru F9, BL2, E3 thru E9.
Hood Units: GP7 thru GP35, SD7 thru SD35,
These all use the famous 567 series diesel. Basically they sound the same with minor variations due to governors, generators, etc. E units came with two 567 diesels under the carbody.
EMD SW1500, GP and SD 38, 39, 40, 40X, 45, and Dash 2s use the 645 series diesel. Again, minor variations due to some mechanical components, especially the Tunnel Motors, but the BASIC EMD turbo charged whine is the same! Oh BTW, the 38 series was non-turbo.
So in a nutshell BLI just has to be consistent with the prime mover sounds. I listened to the sound sample of the new switcher. Defintely a 567, hands down! The E7 by far, sounds the best as you can hear the dual 567s.
I must admit that on the BLI SD40-2, the turbo whine is not well pronounced. The engine almost sounds like a 567 rather than a 645. Unless, the recording came from a GP or SD38. I doubt it though, as the air aspirated 567 has a louder and slightly lower toned exhaust sound than a non-turbo 645 diesel engine.
As for the horns, we can’t nit pick too much as they will vary according to the railroad.
Check out the thread above I posted on horns and click on the link.
Peace!