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If you remove all financial issues with making that happen in the US, the #1 problem with removing cars is that a lot of places outside major cities are spread too far apart for walking to be practical (because most places where people live built within the last century are designed to be reached by cars only). A big reason for the success of rail in Europe is that your final destination is within short walking distance from the train station from which you disembark and most of the US cannot say that.
