Or people would go back to shipping more items by train, since trains are by far the most efficient means of transporting goods. Heck, people might even start riding trains (yes, the slow ones) more often. I used to frequent Amtrak from Los Angeles to Sacramento quite often, and I can only think of one time (if I recall, sometime around Thanksgiving) when the train was more than 50% capacity. And even then, more cars could always have been added to meet demand.
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