When I was a brakeman for the Quanah, Acme & Pacific, our yard at Quanah had NO lights (except for our lanterns). It may have gone back to the WWII days when blackout mentality was everywhere. I don't remember any lights in the SLSF Oklahoma City yard either. It was just DARK.
I think it is great that your O gauge switchmen will be able to see on the midnight job, but no lighting in the yard is very prototypical.
