1938
Book of Rules, D&RGW Operating Department, specified yellow (amber?) and red. Bulletins on the RGS indicate that they were told to match the Rio Grande, substituting yellow for green at that time.
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From the Rio Grande Southern Bulletin Book:
Bulletin Number 20
Durango, Colorado, July 14, 1939
C.H. Rhodes, Foreman, E.D. Randow, Ridgway, H.M. Grays, Durango,
Bulletin Boards, All Agents, All Section Foremen:
Effective at once we will observe D&RGW Book of Rules dated
January 1, 1938. We will use our present Form 19 train orders for
all purposes until supply used up and will equip cabooses and
engines with proper color markers as soon as possible.
O.B. Olson, Superintendent of Transportation and Trainmaster.
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For my modeling purposes, any caboose or tender with a Royal Gorge herald gets green, any with a flying
Rio Grande gets yellow.