To me there is really only one good looking UP Yellow color, now remember I grew up viewing and riding UP Passenger trains including seeing sun faided weathered cars in storage. That yellow color is Scale Coat, which Con Cor switched to 20 years ago atleast after running some cars in horrible canarry yellow. Kato has tinkered with their yellow over the years their current shade is not too bad. Micro trains yellow is nice, but their gray is far too light too late to change it now, all future UP realeases from MT will have the gray wrong. Scale Coat Harbor Mist Gray looks good to me. Life Like did gray that was almost black on their early releases, they got it right on their last run of E Units, walthers passenger cars look pretty good. Now for the IM Centrailia cars. The yellow is a bit light,but looks like weathered cars, their gray in not bad looking. I have been modeling in N so long late 1960"s that I can remember the easy color match with old Testors paints to match Atlas Rivarossi locomotives and cars also Con Cor, just mix a drop of red in with the stock yellow.Then there were the Aurora / Trix Postage stamp pasenger cars just silver with a yellow window band, I repainted mine into yellow and gray and fired off a nasty letter to Aurora asking them to correct the mistake. They never did, Chinese made versions of these cars to this day are silver with a yellow window band. Nate Goodman (Nato). Salt lake, Utah.