The scenery of a model railroad provides the environment through which the trains and railroad pass. In the prototype, the scenery typically came first, and the railroad is built within this environment. The railroad will often alter grades, build tunnels, and bridges spanning canyons. In the model, the track and structures typically come first and the scenery is added afterward. This requires that the scenery looks like it came first, this can be subtle.
The plans for the scenery I plan to use are still in an early stage. The model will be based loosely on Colorado, so fir trees, arid conditions, and more river beds than flowing rivers. As I’ve mentioned elsewhere, I will be building a model of the Glenwood canon area, which will require some serious design and learning to pull off.