Tesla runs America's most productive auto factory. Its new ones are even bigger

Tom Randall and Demetrios Pogkas

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.