Ever wonder where all the streetcars went? A subsidiary of GM bought them, burned them and put in a few buses and sold them back to the city once they were finally destroyed.
Here is a streetcar map of St. Paul and Minneapolis in 1933!
map from here
http://en.wikipedia.org/wiki/Great_American_streetcar_scandal
Taken for a Ride is a great documentary about this scandal.
http://video.google.com/videoplay?docid=-2486235784907931000&ei=BmeISaXpOoS4-QHP–38Cg&q=taken+for+a+ride