At least some of them had dark green anti-glare panels at some point:
[/quote]
I respectfully disagree. That is the dark-sand grey (the gripping surface is readily visible with wear on the paint) that appears on a lot of units. On others its more like dry-concrete grey. In reasonable light, the real colour can be determined by looking at the windscreen front lower edge. The RG seemed to wrap it right up to the glass rubbers whereas other roads left a plain colour strip there.
I have that pic too- there are a plethora of semi-overhead shots. Only 5771 the last F's (F9s set) in later 1968-74 period RGZ and then freight duty are seen with UP style dark green. And it is that obvious it is different to the aforementioned, as far as I can tell.
regards
davew
** Edit- apparently I can only modify with one graphic being added:-
F7 #5564- Lt Grey not green -The Royal Gorge train
in Royal Gorge June 1962 (© unknown).
[ Guests cannot view attachments ]