After midnight, when the traffic is lighter, you might encounter Scheurle (“Shirley”) trailers—oversized flatbeds with a hundred wheels and multiple tractors pulling ultraheavy loads, bits and pieces of cokers and fractionating towers the size of Saturn V rockets. These road trains move at a crawl, but nothing else does and, late at night, 63 is generally left to the semis. Most of them are tandem trailers—B-trains, but not the kind you usually see carrying gas or mail. These are shapes you don’t encounter elsewhere: tubes of liquid nitrogen; heavily reinforced heated cylinders loaded with raw
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