Just above the Lauritzen Gardens in Omaha, Nebraska, is a display of two Union Pacific freight train engines. This photo is one small detail of the older Engine #4023, which was a massive steam engine. As I walked around the engine, I was struck by all of the moving parts that comprise a steam engine, especially the mechanisms that transferred steam to power that turned the massive wheels.
Canon 5DIII 1/125s f/2.8 ISO100 100mm