Interesting coincidence. I was just thinking about asking the same basic question about classification lamps for locomotives in the early steam era, but after reading the answers to the question about the marker lamps, I am not so sure there is a straight forward answer to my question. I’m doing a painting of a standard gage 4-4-0 pulling a freight train in the 1880s. I know that classification lamps have at least two lenses facing in directions 90 degrees apart, and I believe that they can be hung in various states of rotation to display various colors in various directions.
On a train running as a scheduled time freight, not in multiple sections, in the daytime, assuming that the marker lamps each have one lens facing forward and one facing sideways away from the engine, what color would each of these two lenses be? Would the markers be lighted in the daytime?