Model Railroading > Scale Trains SD40-2 sound file

I picked up my two ATSF ST SD40-2's Rivet Counter with sound last Friday. Really, really nice and the running is super smooth. But I noticed something while they idled I have never heard or at least paid attention to. The prime mover idle RPM seems to change. I have attached a video. Is this new or have I had my head in the sand? Don't get me wrong I like it, it's pretty cool.

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High idle/low idle

Are the funky/asymmetrical hood letters on 5125 prototypical?

GP30M Wrote:
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> Are the funky/asymmetrical hood letters on 5125
> prototypical?

Yes, depending on if it was painted by EMD or re-painted by ATSF.

Russ

Looking forward to getting mine running!

Nice layout, too!

~RGDave
http://onondagacutoff.blogspot.com/

The blue pare of the paint looks almost black in the photo's. I assume it's supposed to be blue?

Cheers, Jim

SPDRGWfan Wrote:
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> The blue pare of the paint looks almost black in
> the photo's. I assume it's supposed to be blue?
>
> Cheers, Jim


I have the sane two units and they are indeed blue.

Bob

the Bowser SD40-2F "redbarn" does the same. it may be something to do with a later phase SD40-2 having an exhaust silencer. I noticed that ESU Loksound has a new file for an EMD 645E "silenced". they sound fantastic!

twl


TChad Wrote:
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> But I noticed something while they idled I have never heard or
> at least paid attention to. The prime mover idle
> RPM seems to change.



Edited 2 time(s). Last edit at 02/13/18 15:26 by globalethanol.

Yes they are blue, it's just the lighting.

Later EMDs would idle down when the reverser is centered. Also after working hard they stayed idling high for a bit.
Dang, been a while since I ran a SD40-2:) had to think about that.