A quick and simple method to get rid of the plastic new freight car look is to spray a light coat of Dullcoat.  This will take away the 'toy' train look of your layout.  If you don't have any Testor's Dullcoat you can use any Matte Finish spray to get the same results.  Just a simple spray to each side and let dry.  This can be done to any plastic kits also.

or why did I decide on Z-Scale model railroad.   

    I had been dabbling in N Gauge off and on since 1974, when I gave [ ... ]

Micro-Trains Farmers Co-op Build by Modelersguild.com

I am definitely getting better at Z-Scale. Another Micro-Trains kit, I am liking these more and [ ... ]

Is so awesome!! Not exactly prototypical, but Milwaukee Road none the less! So glad someone made this!!