I can run any machine on this site with my eyes closed, and I do, day after day in that cab. But my back locks up when I climb down now, and my hands ache in the cold. I lie awake wondering what's left for me when these joints finally quit, because running iron is the only thing I've ever been.
More people experience this than they realize.
You can run any machine, but the years have worn your body and you don't know what's left after.
If this sounds familiar, the Library can help you find the bigger picture.