The scale model was very useful in visualizing the layout in 3-D. A number of problems became apparent when the plan was converted to 3-D and were resolved before any bench work was started. I referred to the model all through the layout project and would modify it when the actual plan needed changing. Very few changes were required (mostly grades) and the 3-D scale model proved to be a valuable planning tool. Some of the "cookie cutter" sub roadbed can be seen in the two photos to the right.
The San Juan Southern RR construction began with a 3-D scale model of the layout. Actually it began with a track plan designed with the free Atlas Right Track software. The the track plan was printed in 1" = 1' scale and glued to card stock and the model was built, ala Dave Frary in his very useful book on MRR scenery.
