You look out over the rail yard and the rail yard is a field of steel. The rails fan out from the mainline like fingers from a hand and the fingers from a hand are the tracks and the tracks are where the trains are taken apart and put back together. The rail yard is the backstage of the railroad. The passengers never see the rail yard. The commuters never see the rail yard. The rail yard is where the freight goes to be sorted and the sorting is the work and the work happens at three in the morning under floodlights and the floodlights at three in the morning are the rail yard's hours.

Bailey Yard in North Platte Nebraska is the largest rail yard in the world at two thousand eight hundred and fifty acres and the two thousand eight hundred and fifty acres is a small city made entirely of track. Bailey Yard sorts ten thousand rail cars a day and the sorting ten thousand cars a day means each car must be weighed and classified and directed to the correct track and the directing to the correct track is done by a hump. The hump is a hill. The car is pushed to the top of the hill and uncoupled and the uncoupled car rolls down the hill by gravity and switches direct it to the correct track and the correct track is determined by where the car needs to go. The car rolls and the switches click and the retarders slow the car and the car couples to the train being assembled on the departure track and the assembling on the departure track is the rail yard's product. Bailey Yard runs twenty four hours a day because the freight never stops and the freight never stopping is America's supply chain and America's supply chain runs through North Platte Nebraska.

The Proviso Yard in Chicago sorted the freight that fed the nation for most of the twentieth century. Chicago was the railroad capital of America because every railroad that ran east to west and every railroad that ran north to south crossed at Chicago and the crossing at Chicago meant the freight had to be sorted and the sorting had to happen somewhere and the somewhere was Proviso. The yard covered a thousand acres on the west side of the city and the thousand acres on the west side employed thousands of men and the thousands of men switched cars and coupled cars and uncoupled cars and inspected cars and the inspecting and coupling and switching was the labor of logistics. The switchmen worked in all weather. The switchmen worked between moving cars. The switchmen lost fingers and hands and lives between the couplers and the losing fingers and hands and lives between the couplers was the price of the rail yard.

In Sinclair's Detroit the rail yards at Michigan Central and the yards along the Rouge River brought the materials that built the cars. The rail yard was the mouth of the factory. The iron ore arrived by rail. The coal arrived by rail. The rubber arrived by rail. The finished cars left by rail. The rail yard at the Rouge plant was inside the factory and the inside the factory meant you could not tell where the railroad ended and the factory began and the not being able to tell where the railroad ended and the factory began was Ford's design. Ford wanted the raw materials to enter at one end and the finished car to exit at the other end and the rail yard was the conveyor belt between the world and the assembly line.

You stand on the overpass above the rail yard at night and the rail yard stretches to the horizon and the stretching to the horizon is the scale. The cars sit in rows and the rows are still and the stillness is deceptive because the stillness means the car is waiting and the waiting means the car will move and the moving means the car will be sorted and coupled and sent. A locomotive moves through the yard with its headlight cutting the dark and the headlight cutting the dark is the single eye of commerce. The couplers bang. The air brakes hiss. The radios crackle. The yard never sleeps. The rail yard. The field of steel where freight is sorted. The puzzle that is solved and scrambled and solved again every night. The place where the train becomes trains becomes a train again. The steel field. The iron puzzle. Sorting. Switching. Sending.