ModelRailroadForums.com is a free Model Railroad Discussion Forum and photo gallery. We cover all scales and sizes of model railroads. Online since 2002, it's one of the oldest and largest model railroad forums on the web. Whether you're a master model railroader or just getting started, you'll find something of interest here.
What's the best way to go about adding "grime" to a GP-9? It would be considered relatively new to the line so there wouldn't be any rust per se. But it is in a city environment.