This is an industrial lathe turning a railroad truck. Heavy cranes lift the truck into place on the lathe and then it’s locked in. The lathe will then slowly turn, and a cutting bit will true the wheels to absolutely round (+/- .oo1 inch).
There was very little lighting in this railroad shop so I took 5 exposures and blended them to create a HDR type image. The lens was a 7.5 mm fisheye on my Olympus EM5. Exposure times were 1 second to 4 minutes at f5.6.