This small plan was inspired by an industrial area in Omaha. A lot a license was taken to fit things into the narrow (18 inch) shelf.
The scenery is mocked up from foam insulation, paper and wood pieces to experiment with sight lines and building placement. No sense building a lot of structures to find out they should be a different size.
The train layout overhangs the cabinet by a few inches on each end. If you want to avoid this situation you should probably buy the cabinet first. Do ask how I know this.
The track is temporarily held to the surface with gaffer tape. Now that I'm sure of the final track plan I'll glue the track in place and start on the scenery.