Kevin at Fortworthology sent me this map of the streetcar lines of 1925 overlaid with the current plan. It's interesting to see what was lost in cities around the country who have done this exercise. Also note the street grids that exist around the former lines. Compared to the networks that the streetcar built, auto culture looks so messy. I'm sure there is some sort of analogy for that.
If you've seen one of these overlays somewhere, shoot a link in the comments and I'll append them to this post.