I started this thread because I purchased a Trainworx corrugated 52 foot gondola. The Trainworx model is newer than I wanted (conspicuosity strips) so I removed the strips by soaking a small piece of tissue with Micro Sol and soaking them individually until they would rub off with a little encouragement from either a Q tip or a wooden tooth pick carved to a flat end. Soaking time was usually around 10 to 15 minutes. I soaked the stripes that extended under the ladders much longer so as to minimize damaging the ladders while removing the stripe. A coat of Testor's Dull Coat from a rattle can and here is the result.
So what's in my empty gondola?
A floor that was made to look used by a combination of paints, powders, chalks and chalk dust. I have a cookie tin filled with used coloured chalks. Over the years, the bottom of the tin has been covered with a nice mixture of chalk dust that can be brushed onto a surface and fixed in place with dull coat. I am rather pleased with the results.
And finally some pallets ( Micro Engineering part # 80-144) sprayed with TamiyaTS-46 (Light Sand) for that wood look with also aged with chalks, chalk dust and covered with dull coat.