This Map is based on Sanborn Maps from 1899-1900. The Beta release is a stripped version, simple ROW linework and can be found at:
[img]Sample_Belt_Loop_1.jpg[img]
The full-blown version with overlayed 3D buildings to put the ROW in a period Geographic context is still being built and is also a trial to help us help you with more sophisticated mapping routines.
1) Google Earth Basic (free) http://earth.google.com/download-earth.html
2) Google's Sketch-Up (free version) http://sketchup.google.com/download/
I also used AutoCAD 2004, only to avoid most of the learning curve in SKetch-UP. Sketch-UP is being used to convert the file to one readable by Google Earth, for texturing, and labeling buildings.
Craig Hoefer
http://www.pacificng.com