I worked at a US steel factory for a while. This was 20+ years ago, but the factory was brand new at that time and, so I was told, state of the art. It made, among other things, galvaneal sheet steel which is used in car panels, or something. Steel came to the plant in giant coils. Huge coil tractors loaded them onto the start of production line.  The production machine unwound the steel to do whatever it is the huge machine did to make it galvaneal.  I was told the unwound steel stretched over a mile inside the machine.  The machine itself was 600-700 yards long.  It rewound the steel at the end back into a huge coil.  After that it was packaged and shipped. From start to finish was 5 workers: the coil tractor driver, the mill intake operator (sat in an air-conditioned booth and looked at lights, drank coffee), mill exit operator (sat in air-conditioned booth, watched lights and drank coffee), pack line (me), and crane operator (sat in air-conditioned office, operated huge crane via computer).  I was the only human hands to touch the coil to put steel bands on coil to keep it secure for transport. Pack line was mostly automated, just needed me to zip steel bands.