Left over kit pieces or scrap can be used to create gondola scrap loads.  spray the pieces brown or gray and add your pigments, rust, dirt, or grime as you wish.

Hopper Weathering Clinic II
By Bill Mock
December 2009

So here's how those BN Hoppers turned out after the surface rust dried. Not bad. I'll [ ... ]

Micro-Trains Logging Camp Cars Build by Modelersguild.com

Working with my brother-in-law has its challenges. It doesn't always go so well, some of you [ ... ]

Scratch building is defined in Wikipedia as “The process of building a scale model "from scratch", ie. from raw materials, rather than building it from [ ... ]