I agree with the others.... looks great. I'm also sure if you looked at enough photos of actual MOW cars, you could probably find something pretty close to what you've done since the real railroads were "recycling" long before that word became part of our culture.
But as a footnote, decals don't adhere well to flat paint. So you'd be advised to gloss coat any area that is going to have decals.
Another possible avenue are the Microscale little bottles of flat, satin and gloss clear finish, called MicroFlat… etc. Though I've never tried brushing on the MicroGloss over flat paint. And yes, I used those same Krylon spray cans for my projects. That Ruddy Brown Primer is a good railroad color. But I always spray gloss my projects (in preparation for decals) before I get as far along as you have.
Once the decal work is done, then I use a couple sprays of the Krylon Flat. Hopefully you can get the car apart enough to do some gloss sprays. One trick I've done when necessary, is to wrap the trucks with baggie type sandwich bags.
Thanks for the tip about the decals won't adhere to the flat paint.
I did build this car to where I can take it apart.