I'm not as big of a diesel fan for the same reason.
They are a different animal from a steam engine.
The early stylings and the carbody frame hold more of my interest than the "ambiance" of diesels in action. The early RS were the last switcher style I liked a lot.
But I do like the Plymouths, Vulcans, & esp. Whitcombs though. Again different animals than the large. Maybe claim it as one of the 4 stroke gasoline engines 
Electrics are even quieter, even with sound it's just load up humming and fans cycling. They have to have pantographs vs 3rd rail before I'm smiling too.
If it was a postwar version you might actually like the "growl" of the vertical open frame motors; it's growl fills a certain sensory gap between reality and imagination imo.
A small filter cap wont hurt, but isn't needed ...yet. Future additions may call for some smoothing of the BR ripple, but not yet.
