The 3D view is created using the polyline feature of Cadrail and although I didn't spend much time drawing them in, the feature does a reasonable job at presenting a general perspective of the overall design. I found this view useful in planning the module framework, most especially with regard to the canyon region.
Four tunnels, one for each set of mainline entrances to the module, are used to provide scenic separation of the canyon area from other modules so as to "frame" the scene in order to focus on the bridges over the canyon. When all is done, there will be a flowing river with a waterfall carving its way through the canyon.
