Now that I'm well into construction it might not be a bad time to work up a track plan. I simply love drawing track plans and have probably done hundreds of them over the years. This one is fairly elaborate and focuses primarily on the scenic treatment. Grid spacing is 12".
The basic track plan was drawn with XTrackCad, a free open source track planning software. Once I'm happy with the track layout, I import a screenshot of the plan into Adobe Photoshop to do the final rendering.