I've uploaded the baseboard set for "Galesburg-Chillicothe" to the DLS, and it should be released in a day or two, depending on when Auran gets their equipment back on line.
If you don't have the HOG textures yet, you'll need them for the data lines. They are at this site here...
http://www.fishlips.net/Trainz/Hog Textures/
The basic instructions and sources are here...
http://freepages.misc.rootsweb.com/~wewain/trainz/Surveyor/Baseboard/Topology/TerrainGeneration/Computer-generatedTerrain.htm on the Wewain DEM/HOG tutorial.
Also search the forums for "fishlips". The question of how to install the textures to various versions seems to come up fairly frequently, and that brings up some answers.
Apache62 has already expressed an interest in the Galesburg yard, so that might be a good place to start. Finish off the baseboards of the yard itself, then save as a different name and delete the other baseboards and upload it. You'll have a finished layout then, and when you go back to the original layout, the yard will be ready to expand from.
Take your time and enjoy it. And thanks for an interesting project.

Claude