... another anomaly, depending on which railroad is operating a particular locomotive... the headlamp could be mounted on top of the smokebox, as you've illustrated, or at any height on the smokebox door. Interestingly, different railroads, operating the same identical model of locomotive, very often had a preference for their own distinct variation of a unique headlamp... could be size or shape... as a sort of a distinguishing characteristic. The recently reactivated UP 4014's headlamp sits well ahead of the smokebox and over top the pilot. Headlamp minutiae is a fascinating study in itself. I'm not being picky, just adding to the lore... and you nailed a basic truth.
Artist Reply: Indeed Jim, unlike the European locomotives, where the headlight was purely functional, it seems that the American railway companies almost used it as a calling card. It appears that this is also the case for the copper bell and the decoration of the cabin. Quite a difference with the sober version in Europe.