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This was such an informative book! I learned about those who drive the 18 wheelers back and forth across the continent. Depending on what they carry, they have to have papers, do a wash afterwards and travel long distances, know the routes, etc.. I also learned about those who captain and work on cargo ships that pass through canals, rivers, lakes and oceans. The last one he describes is the trains- those that carry coal mostly, but also other goods. The signals, speeds, coupling and uncoupling and waiting for the yard man to okay your train and your route. Fascinating!