Draw a road and railroad track

I am drawing a complete aircrew training facility of the 40’s-50’s that we are building here in Eureka Springs, AR. I have most of the buildings built and placed, however, we have roads, sidewalks, train tracks etc. and I have no idea how to make them freely curve to overlay the actual roads, walks etc. shown in our google map. Thanks for your help.
Errol

Using the Drape Tool you can project a plan view of roads, walkways, etc. down onto your terrain so that the outline follows the terrain contour.

-Gully