trying to find out more about the operation of most lights, i have come to the conclusion that practically nothing was universally accepted practice and to find out anything you had to reference the particular railroad's rules & regulations. when i asked about NKP practices recently, i'm sure the answer regarding Mars light operation was, 'whenever the headlight was on and the engine was moving'. as far as i know, there was no "emergency red' setting on the NKP light.
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