Now I am going to make an assumption here: the red oscillating warning lights employed on Union Pacific and Milwaukee Road 4-8-4's and Milw 4-6-4's were Mars Lights. On the Milwaukee, they counter-balanced the somewhat jarring appearance of the Milwaukee's off-set bells - and were esthetically succesful. All of these applications enhanced the appearance of the locomotives - adding some additional color and an air seriousness. Of course, just opinion!! One man, one vote!
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