A cute layout, I must say!
And I know now that the Kuhfänger is a cow-catcher in English, one never stops learning
I add a photo of my R 4000 (sold some years ago). You will find some differences. I am not a Märklin loco expert, but I think that the change from central oiler (as in your R 4010) to two separate oiler cups is rather an indicator of production date (yours should be earlier) than establishing the difference between R 4000 and R 4010...
I will try to check this...
Thanks for sharing the video!
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