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Operating rules dictate colors of marker lights and how they are to be displayed. Note that the rules are subjcet to variation from one railroad to another, and that the rules have changed over the years. In most standardized rule books, Rule 19 will govern markers. The most common application calls for red to be displayed to the rear of the train, and green to be shown to the side and front. The Santa Fe and some other railroads called for red to be shown to the rear, and yellow to be shown to the side and front. The rules have changed over time as to conditions under which a color other than red was to be displayed to the rear. Since it isn't practicable to "turn" or change colors on model marker lamps, I'd go with red to the rear and, depending on your prototype, either green for the other 2 lenses, or yellow for the other 2. John
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