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Discussion Starter #1
I was running a Railsounds tender with a postwar engine. And the whistle was sputtering, not continuous. Couldn't find anything wrong with the tender. So I tried different engines with the tender, and noticed a pattern: With modern engines, the sound was fine. But with postwar engines, the sound was not.

I tend to keep engines and tenders matched correctly. But it's still funny I never noticed this before. Is this a known incompatibility?

Any ideas? Thanks.
 

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Not sure - I have never run Railsounds with postwar engines or thought about it, but as an electrical engineer I can think of several things that could be going on with the postwar electrical e-unit and the old style open frame type motors(as opposed to electronic e-units and can motors today) that could be causing the issue.

If I get a chance today I will get a postwar loco or two down from the shelf and run them with several railsounds cars I have and see what occurs.
 

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I have a Railsounds boxcar that has run with both post war and modern locos with no strange effects.
 

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Probably it would be useful to add some EMI suppression to the PW locomotive. If you've ever looked, TMCC locomotives with the A/C motors all have shunted brushes as well as a noise suppression cap from the brush to ground. This would be my first step.
 

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Discussion Starter #5
Probably it would be useful to add some EMI suppression to the PW locomotive. If you've ever looked, TMCC locomotives with the A/C motors all have shunted brushes as well as a noise suppression cap from the brush to ground. This would be my first step.
John,

Thank you.

Do you mean that postwar engines are making more electromagnetic noise? ...Or at least more than modern engines?

I would like to understand the cause as much as anything.

Thanks again.
 
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