Elon Musk has a very specific vision for the ideal  factory: densely packed, vertically integrated and unusually massive.  During Tesla Inc.’s early days of mass production, he was chided for  what was perceived as hubris. Now, Tesla’s original California factory  has achieved a brag-worthy title: the most productive auto plant in  North America.
       Last year Tesla’s factory in Fremont, California,  produced an average of 8,550 cars a week. That’s more than Toyota Motor  Corp.’s juggernaut in Georgetown, Kentucky (8,427 cars a week), BMW AG’s  Spartanburg hub in South Carolina (8,343) or Ford Motor Co.’s iconic  truck plant in Dearborn, Michigan (5,564), according to a Bloomberg  analysis of production data from more than 70 manufacturing facilities.
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